- cctalk - classiccmp.org

by Paul Pierce

Al has a reader at CHM. They can read tapes too, my 7-track setup is now at System Source. Paul > On Sat, 2025-02-15 at 14:52 +0000, Sid Jones via cctalk wrote: > > IIRC, I have a copy of the Elliot 803 A-103 Algol compiler on a five- > > hole > > tape in a drawer somewhere in my untidy office... > > > > As used in UCNW Bangor, 1971-1974. > > There might be a reader somewhere. If anybody has (or developes) an > 803B emulator, it would be nice to have the compiler. > > Paul Pierce read several IBM 1401 tapes. The Computer History Museum in > Mountain View, CA has two operating 1401s, and the SimH project has an > emulator. It's nice to have the Autocoder assembler, FORTRAN II and > FORTRAN IV compilers, COBOL compiler, â¦ to use. There are students at > San Jose State University who go to classes in 1401 programming at CHM. > > Maybe Paul has a paper tape reader too. > > > >

5 months, 2 weeks

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Dan Sokol (and bits about the Apple I and the 6502 procurement)

by Jim Brain

https://thisistrue.com/sokol-behind-scenes/ It's probably not overly important how the 6502s got sourced for the Apple I, but here's a different take. Debate as you see fit, I'm just the messenger. Jim -- Jim Brain brain(a)jbrain.com www.jbrain.com

5 months, 2 weeks

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RS232 then and now

by Steve Lewis

Hey all! So, I've found myself studying up on RS-232 this year for a few reasons. I'm mulling over doing an RS232 themed talk at June VCF. Not a super exciting topic, but I do think that RS232 has an interesting history: In the SAGE relationship, and as a follow up to (essentially) prior telegraph communication. From what I've read, "50 baud" was a kind of an initial goal to beat, since that's what the top telegraph operators could achieve (in small burst, probably not all day). And those operators did have to also deal with things like start/stop "bits". Maybe it wasn't an intentional goal, but just that it establishes why "50 baud" is generally the lowest we ever see mentioned (or, if you go slower than that, might as well use the older tech). Then 75/110/130 baud to have digital-systems interoperate with classic mechanical teletypes. Going any faster and those systems jam up or overheat? These weren't yet called "serial ports", so I'm not sure what a late 50s system would even call their equipment that facilitate this data exchange (since I'm not sure what kind of crystal-clock they even had yet). Then, was it the SAGE program that demonstrated the idea of doing this kind of data exchange across copper phone lines? That is, the idea of computers collaborating not just in a room, but across long distances (miles)? And doing so by using an audio tone presentation? (they settled on around 3100MHz, which ended up translating to 300 baud? hence, that's basically why the first digital to digital system data exchange settled on that baud rate, which was reliable on both 50 and 60Hz power systems, and meaningfully faster than prior 110 baud - so a good milestone to turn it into a product, which was the Bell Model 103?). I couldn't find much details (like a manual) on the Bell 101 equipment (anyone seen one or have a manual?). But I did find the Bell 103 manual - the photo of its innards is grainy, so I don't understand how the Bell 103 did 300 baud without a UART (and one of the pinout lines I see did run power, so not sure if that's-yet RS232 or not; I know RS232 was evolving right at that same time circa 1962). I've about the 1970ish TR1402 initial DIP UART, with anything prior being an experiment (like a full board concept by DEC). I know from 1962, both RS232 and ASCII standards still took maybe another decade to really gain traction as standards (at least, from what I've read). Getting the world to comply with any standard always takes a lot of effort (for a practical reason of everyone still having invested in the older tooling that was still functional). But it's interesting how those two standards are still in use (not in their original form, but least the 1967 revisions) - extending from Baudot.and late 1800s-tech on telegraphs. Does anyone know of any grocery stories using RS232 in the 1960s? I think barcode scanning was just introduced in that era. I can just imagine a smart grocery store owner, in the backroom programming their minicomputer for payroll and inventory management. In FORTRAN and without a CRT? Actually, in the 60s, I think included software would be negotiated with the provider of the computer (well, I'm not sure how that differed between minis and mainframes). I know early microcomputers used RS232 for keyboards (1974-1976 era). The IBM PC keyboard is essentially another form of serial. Well, sorry for the rambling - have other RS232 related questions, but first wanted to focus on the historical aspects (and see if I'm somewhat on the right track at least). -Steve

5 months, 2 weeks

31
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Ad-blocking (was Re: Open source a panacea?)

by John

On Fri, 14 Feb 2025 12:00:07 -0600 cctalk-request(a)classiccmp.org wrote: > I can't believe people do use it any more without filtering. I've > used an ad-blocking web browser for some years but I occasionally see > the real thing when setting up a new machine. Absurd. It really is astonishing how bad it's gotten - fully the equal of the early '00s when sites might just spawn a dozen pop-ups and only one of the major browsers let you block them, only now there's a pile of JS mining crypto in the background, to boot :/ Been running with NoScript and an ad-blocker as my standard configuration for many, many years now, but it's always sobering to get a look at what other people see...

5 months, 2 weeks

3
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NCR EM-D2 Card reader manual

by Mattis Lind

I am about to get a NCR EM-D2 card reader, but I can not find much documentation on it. Is there anyone here that has documentation on it? Preferably a maintenance manual. A couple of years ago (perhaps in February 2021 if one studies how they indexed the file in their storage) there was a sale of a maintenance manual on Ebay according to the below Worthpoint link. https://www.worthpoint.com/worthopedia/1965-ncr-em-d2-punched-card-reader-3… Did anyone here buy this manual? I am very interested in a scan of this manual or possibly to purchase the manual. /Mattis

5 months, 2 weeks

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Mid-Atlantic Retro Computing Hobbyists Hack-a-Thon

by Jeffrey Brace

DATE: March 8 & 9, 2025 LOCATION: InfoAge Science and History Museums, Wall, NJ Fee: None *More info here*: https://vcfed.org/2025/02/13/march-hack-a-thon/

5 months, 2 weeks

2
1
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Looking for information on Megan Gentry, former RT-11 developer

by Hans-Ulrich Hölscher

Does anyone know anything about the whereabouts of Megan Gentry, former RT-11 developer? She left her last trace in 2020, when she ported ZEMU to RT-11.

5 months, 2 weeks

6
6
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Vintage Computer Festival Montreal Survey

by Jeffrey Brace

We invite you to take part in a brief, anonymous survey about VCF Montreal. Click here https://bit.ly/vcfm2026pre-en Nous vous invitons à participer à un bref sondage anonyme sur VCF Montréal. Cliquez ici https://bit.ly/vcfm2026pre-fr Jeff Brace Vintage Computer Federation Vice President

5 months, 2 weeks

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Use (abuse?) of a 7924 in a +24 PS...

by William Sudbrink

I'm repairing/restoring a later model MITS 8 inch floppy drive. I can not seem to find schematics for it. It is the same as Bill Degnan has here: https://vintagecomputer.net/MITS/88-DCDD/ You can see in his photos (and mine match) that the _plus_ 24 volt DC supply on the board uses a 7924 (note the 9. negative) voltage regulator, with a small heat sink, directly on the circuit board. Along with a couple of 7805s, there is a .Motorola 2n6045 screwed to the large black heat sink. All three of the devices drop into sockets on the circuit board to allow the heat sink to be easily installed/removed. On my unit, the socket for the 2n6045 was burnt to a crisp. I have replace the socket, the 2n6045, the 7924 and the electrolytic caps. When I test the +24 volt rail with a dummy load, it measures +41 volts. I don't understand this circuit. I know MITS was notorious for its power supplies. Does anyone have the schematics for this version of the 8 inch floppy? Any suggestions? Thanks, Bill S. -- This email has been checked for viruses by Avast antivirus software. www.avast.com

5 months, 3 weeks

2
4
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Re: Looking for IBM 2723

by Tony White

A 2838 card can be used instead of a 2723. keith

5 months, 3 weeks

1
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Re: Looking for IBM 2723

by Tony White

You can use a 2838 card instead of the 2723.

5 months, 3 weeks

1
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Microsoft 50 years

by Christian Liendo

I was debating sending this, but Microsoft is part of computing history and fifty years is a milestone. https://news.microsoft.com/microsoft-50/

5 months, 4 weeks

14
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Re: RS232 then and now

by Robert Feldman

>Message: 26 >Date: Sat, 1 Feb 2025 18:13:17 -0500 >From: Nigel Johnson Ham <g4ajq1(a)gmail.com> >Subject: [cctalk] Re: RS232 then and now > >On 2025-02-01 18:11, Chuck Guzis via cctalk wrote: >> One mystery to me was why did the industry stick with the EIA-232 levels >> for terminals and whatnot long after differential EIA-422 was >> introduced. Higher-speed, better noise immunity, single-ended power >> supply... Seems that the popular places were Appletalk and ST506 data >> lines. But not on DTE/DCE. If you were using full-voltage (±15-±25) >> at high speeds (>500Kbps), the slew rates were ridiculous. >> >> Inertia? My old 80286 motherboard had junper-selectable 232 or 422. >> >> Still have a couple of tubes of 422 drivers/receivers. >> >> --Chuck >> >DEC had RS422 available on their DLJ11J four-port interface, but I never >saw it used in the field. > The Otrona Attache has two serial ports, DA-15 female, that are jumper selectable between RS-232C, RS-422 or RS-423. Bob

6 months

1
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A baudy tale

by Donald Whittemore

In the early 70s my employer used stand alone data entry tape units in our remote locations. We started with NCR units but then switched to Tally. In the late afternoon the data would be transmitted to the home office in Chicago for processing. Also using NCR/Tally units. We used Racal-Milgo modems. These things were about the size of a large home stereo receiver. We started at 2400 baud. The units could do 3600 or 4800 (I don’t remember which) if a circuit board strap was moved. We had locations in many cities/towns all the way out to Montana. It was decided that we needed to have the ability to switch between 2400 and the faster speed when possible. We did not want to have the locals power off the modem, open it up, remove a card and move the strap. So I got volunteered to come up with a plan. I found a place in the modem where I could mount a switch. Luckily the modem had a sliding panel on the front so the locals would not have to open the box top. Went to our fleet garage where they had the tools I needed. I made a bunch of aluminum brackets for a tiny toggle switch. Added wires to the switch. It was also decided that we could not trust the locals to do the switch install. So part of the plan included me going to all the locations and doing the install. I did not have a car at the time so I got a fleet car. Headed south to Kentucky then turned west. Don’t remember all the states I hit but I believe the last place I hit on the way home was Rockford. I remember being on a back road in Montana and I took a picture of my speedometer. I was doing 65. This was when there was a countrywide speed limit of 55. I can’t be limited by the Man. :) Back at the home office we had 6 NCR/Tally machines and only 4 modems. I built a plug panel box that had everything wired to it and used telephone jack plugs to connect the Tally’s to an available modem. The box also had switches for the modem speed. I now forget how long the whole process took. Put my DeVry AAS degree to good use. :)

6 months

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Re: Microsoft history

by Murray McCullough

Microsoft, or is it Micro-Soft or MICROSOFT, is a 50 yr. old trans-national corporation. Whether it has been good or not-so-good for society is debatable but on the financial-side its been very kind to investors(the earliest ones anyways). Capitalism certainly owes Microsoft a good nod! Happy computing. Murray 🙂

6 months

3
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Re: Seeking a MC75325L Dual Memory Driver

by pbirkel＠gmail.com

Follow-up: Vendor now on eBay for Fairchild 75325DC in lots-of-five; they accepted my Best Offer. https://www.ebay.com/itm/333675901157 So now I can get back to making some progress on repairing the H222A in my MM11-DP :-}! From: pbirkel(a)gmail.com Sent: Friday, March 11, 2022 10:01 AM To: General Discussion: On-Topic Posts <cctech(a)classiccmp.org> Subject: Seeking a MC75325L Dual Memory Driver I have here in my hands a DEC H222A (16Kx18), part of a MM11-DP, that took a blow at sometime in the past. In consequence there are a number of small parts damaged (snapped diode, crushed axial electrolytic, chipped mica capacitor, cracked/broken SIP resister net) but those all appear to be relatively easy to replace. What's not so easy to replace is the MC75325L Dual Memory Driver (L = Ceramic) that was de-lidded in the process :-<. I am wondering whether anyone has one of these ICs in their spare parts drawer that I could acquire? I do see a MC75325P (plastic) on eBay at littlediode_components for ~20USD, plus a surprisingly modest shipping charge (Royal Mail International). UTSOURCE claims to have a supplier of the ceramic part "new", with a significantly higher shipping charge. Before I go with the ceramic part (IMO not the sort of packaging that gets . remarked) I thought that I would check here for alternative sources. Thank you, paul

6 months

1
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Re: How enough is Enough? Was Re: Re: AI? Really?

by Kevin Anderson

I prefer to use the Daily Digest mode. Then you can quickly glance at the topics and decide whether it is worth reading any particular messages. The pain comes when you may want to contribute something, as then you need to reconstruct enough of the message of concern in a new composition and reply that way. Kevin Anderson Dubuque, Iowa

6 months

2
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Re: AI? Really?

by donald donaldwhittemore.com

I don’t trip and fall. I perform gravity checks.

6 months

11
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Re: AI? Really?

by Robert Feldman

Message: 3 Date: Thu, 23 Jan 2025 08:44:29 -0700 From: ben <bfranchuk(a)jetnet.ab.ca> Subject: [cctalk] Re: AI? Really? On 2025-01-23 8:15 a.m., Alexander Schreiber wrote: On Tue, Jan 21, 2025 at 12:52:49PM -0700, ben via cctalk wrote: On 2025-01-21 10:54 a.m., Paul Koning wrote: Uh, what? How would the earth surface gravity be that much different? "Citation needed" as Wikipedia would say. paul https://en.wikipedia.org/wiki/Autodynamics Ah, crackpot nonsense: "mainstream physicists have considered autodynamics a crackpot theory for decades" - which is right there on the Wikipedia page. Kind regards, Alex. How lucky I am that I am not a "mainstream physicist". A true scientist looks at the evidence, not what is discussed by others. I also like the expanding earth theory, vs continental drift. Where is all that energy to move the plates around. The answer to your question is one that even mainstream physicists (Lord Kelvin) have gotten wrong in the past. See https://www.americanscientist.org/article/kelvin-perry-and-the-age-of-the-e…

6 months, 1 week

13
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AI? Really?

by Bill Gunshannon

A little humor for the group. Among my other "legacy" systems I also have and still fool around with a bunch of TRS-80's. Believe it or not, the Z80 based TRS-80's were among the systems for which a version of STVOS was available. Thought I would look to see if any of it was still floating around. Asked Google "TRS-80 Software Tools Virtual Operating System" Got this result at the top of my response generated by whatever AI engine they use. -------------------------------------------------------------------------- A "TRS-80 Software Tools Virtual Operating System" refers to a software program that allows a modern computer to emulate a vintage TRS-80 computer, essentially creating a virtual environment where you can run old TRS-80 software, including operating systems like TRSDOS, by simulating the hardware and functionality of the original machine, letting you access and use programs designed for the TRS-80 on your current computer. --------------------------------------------------------------------------- That is the biggest pile of steaming poo I have ever seen come out of any of the various AI engines I have run into. Not one piece of it is accurate other than the mention of TRSDOS. I also have a bunch of iRobot Roombas in my house. Based on my experience with AI and robots I think there is no chance we will have to worry about any Terminators in the future. bill

6 months, 1 week

29
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TMS9981A - CPU needed...

by John Robertson

Hi Folks! Anyone have one or more of the old TI CPUs? The usual suspects don't stock it (Unicorn, Abra, Jameco...). I have a customers game board in where the CPU was backwards and previously destroyed... In case anyone is curious the game was from Japan - Universal's COSMIC GUERILLA. This is NOT the TMS9918A - video chip - that some folks are trying to emulate with Raspberry Pi(e)s. Thanks! John :-#)# -- John's Jukes Ltd. 7 - 3979 Marine Way, Burnaby, BC, Canada V5J 5E3 Call (604)872-5757 (Pinballs, Jukes, Video Games) flippers.com "Old pinballers never die, they just flip out"

6 months, 1 week

3
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Re: Ram and vram

by Teo Zenios

How much for the quadra VRAM and how many are there? -----------------------------------------From: "Juan del Pino via cctalk" To: cctalk(a)classiccmp.org Cc: "Juan del Pino" Sent: Tuesday January 21 2025 11:24:00AM Subject: [cctalk] Ram and vram Hello, people: anyone interested? hitachi hb56a19a. 150 TC514400ASJ-70 256KB VRAM Apple Macintosh Quadra 700 900 950 68-Pin SIMM RAM 70ns MT42C8128DJ-7 50 IBM Memory Ram 4MB 1M x 32 B1D1320BA-7 DRAM SIMM 72 PINES 60NS 16MB TI TMS417409ADJ-2E. x2 Thanks

6 months, 1 week

2
1
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Ram and vram

by Juan del Pino

Hello, people: anyone interested? hitachi hb56a19a. 150 TC514400ASJ-70 256KB VRAM Apple Macintosh Quadra 700 900 950 68-Pin SIMM RAM 70ns MT42C8128DJ-7 50 IBM Memory Ram 4MB 1M x 32 B1D1320BA-7 DRAM SIMM 72 PINES 60NS 16MB TI TMS417409ADJ-2E. x2 Thanks

6 months, 1 week

1
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Looking for bootable floppy image for a PDP11/20

by Martin Eberhard

I'm in the process of restoring a PDP11/20. Here is what is working so far: KA11 PDP11/20 CPU , power supply, programmer's console, etc. 32Kx16 SRAM/ROM board of my own design (Core memory will come later!) KE11-A Extended Arithmetic Element RX211 controller with RX02 drive, cleaned, spindle bearings replaced, aligned, tested, and working DL11-W Serial Line Unit with Real-Time Clock DL11 2nd serial port, modified to operate at 19,200 baud VT100, connected to the DL11-W I've written a program that lets me load a raw disk image (via Xmodem protocol) from the serial port onto a floppy disk, and verify the write. This works great, for both single-density and double-density. (It can set the media density as needed too.) I'm now looking for a bootable RT-11 floppy disk image (just a raw image, e.g. .IMG) that can boot and run on this limited hardware. The file should be exactly 256,256 bytes long if single-density, or 512,512 bytes long of double-density. (Actually, anything bootable on this hardware would be appreciated!) I'm new to this forum - let me know what is the protocol for giving you my email address... Thanks! Martin E.

6 months, 1 week

6
9
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null modem for DEC Pro 380

by Cameron Kaiser

DEC Pro owners: does the DEC Professional use a straight-thru serial cable, or null? -- ------------------------------------ personal: http://www.cameronkaiser.com/ -- Cameron Kaiser * Floodgap Systems * www.floodgap.com * ckaiser(a)floodgap.com -- BOND THEME NOW PLAYING: "All-Time High" from "Octopussy" -------------------

6 months, 1 week

2
5
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VCF EAST 2025 CALL FOR VOLUNTEERS!

by Jeffrey Brace

Volunteers are the backbone of making VCF East one of the best vintage computer shows. We are in need of volunteers in all areas. VCF East 2025 <https://vcfed.org/events/vintage-computer-festival-east/> takes place April 4-6 in Wall, NJ at the InfoAge Science and History Museums. Register to become a volunteer today! <https://docs.google.com/forms/d/e/1FAIpQLScRIqB1ZuseQ2ANYszT2RTw2_AMnnCv0ZI…> Click here to read Volunteer FAQ <https://vcfed.org/vcf-east-volunteers-faq/> Thanks! Jeff Brace VCF East Showrunner Vintage Computer Federation is a 501c3 charity https://vcfed.org/ <http://www.vcfed.org/>

6 months, 1 week

1
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AI? Really?

by Anders Gustafsson

Yes. I tried Operas Aria and asked a bit about HP1000 A-series. I started by asking the difference between A900 and A400 and got a reply that was partly correct, then followed up with some specific questions about the A400 that I happen to know rather well. It insisted that it had only 32Mb and it corrected itself. But the problem as always was that the answer LOOKED ok, but there was no way, without prior knowledge to weed out the errors. -- Med vänlig hälsning Anders Gustafsson, ingenjör

6 months, 2 weeks

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New DRAM (SIMM) board works but gives a parity error, only on cold powerup

by Anders Gustafsson

OK. As usual was the problem quite evident, once I understood it... I have two A400 boards. On that board I tested with I never took note of switch 8. It was unfortunately set to OFF indicating that there was backup power for memory. Thus the power lost flag was never set, which caused the parity error on startup. -- Med vänlig hälsning Anders Gustafsson, ingenjör

6 months, 2 weeks

1
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CDC Cyber 18x parts

by hupfadekroua

Hello all, I‘m searching the following CDC parts: 52948476 CM Board extender 91915206 CM Board extender 24614635 ZIF Board extender Of course I do know looking for such kind of items in our days may be some kind of peculiar, but who knows … Andreas

6 months, 2 weeks

2
2
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Try Algol 68 on Windows

by Mike Parr

Hello all. Here is a link to something I wrote - brief intro to Algol 68's background, and how to run it on Windows - with a toy IDE as well. https://mikeparr.info/algol68.html Mike Parr

6 months, 2 weeks

25
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Re: AI? Really?

by donald donaldwhittemore.com

Skynet became self-aware on August 29, 1997, at 2:14 a.m. EDT.

6 months, 2 weeks

1
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OT: not that classic but already old: Cubieboard2

by Holm Tiffe

Hi all, I've got 3 pcs. Cubieboard 2 SBC's with the Allwinner A20 SOC Chip on them. That's kind of a RaspberryPi SBC with an 2 Code Arm7hf on it. The boards are equipped with HDMI, USB, Ethernet (100Tx), SATA, SD Card slot and some 4G NAND Flash Cip on it. RAM is 1 Gbyte, CPU Clock is 996Mhz. Additionally I've bought some Base Boards for them, that's the DVK521 from Waveshare..contains the Baseboard, an Camera Module OV670, a 7" LCD with LVDS, a thermo sensor and other things.. Good HW in my eyes, but already outdated. I wnt to use the boards for some Home/house related stuff, PV, heating, Light control etc. and for that they should be more than enough. The Chips even have an graphics accelerator in the SOC. Now the Problem: as far as I know Allwinner has made some mistake using gnu/Linux stuff without any respecting the GPL. Because of that (if no other cause) most of the support Software on the net seems to be gone. There where some different Linux distributions for it, (Linaro, Cubieez etc) but most of the stuff isn't available anymore because of dead links. I've successfully build an modern Armbian image for them..but have endless trouble. The Xserver configutres an not existing Video Output, the LCD is unknown at all and if I manage to switch the X-server to the HDMI output using xrandr (only with tricks because it needs a session) the performance is like some old thick glue... Besides of that I had to fix an already for 8 years known Bug in the A20 Ethernet driver (it simpy has a more modern ethernet Unit as the A10 inside) that was'nt fixed at all. Armbian has only "community Support" fo those chips..which means that there is no support at all. If one asks for help the answer is more or less "find it yourself and provide a patch". I have an Linaro disk image that seems to be working, but there are some parts missing. The base distribution seems to be ubuntu 12.04 LTS (precise Pangolin) for armhf. I can't find a package repository anymore..(since that's long outdated). I've managed to install ssh by using an tarball of an ubuntu 12.04 armhf image for another board..and it works..but sshd is still missing. There are more modern disk images at https://mega.nz/folder/ZtwxCCJC#AIYHcTqz-ucjuzKnE9qD7A/folder/t0p2SBQD but mostly they don't even boot..possibly they using an newer/other uboot and uboot-envirnonment... Now the question: Is someone in the world still using those boards and has disk images/software for them? Again: I'ts not that much interesting that this is old linux, because I'll use that only inhouse in the lan, not browsing actual websites.. I'm a BSD guy and not know that much about Linux, especially such things as configurations for uboot etc. and there is none that I could ask for such things. Kind Regards, Holm -- Technik Service u. Handel Tiffe, www.tsht.de, Holm Tiffe, Goethestrasse 15, 09569 Oederan, USt-Id: DE253710583 info(a)tsht.de Tel +49 37292 709778 Mobil: 0172 8790 741

6 months, 2 weeks

3
3
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Fanuc Tape Reader PECs 1980's - Connector Identification

by Martin Bishop

1980's Fanuc tape reader PECs are fitted with two families of connector I am unfamiliar with : one is used for power and the other for signal connections -further detail and pictures in the following VCF post No joy on Burndy website or at BitSavers - wisdom gratefully received https://forum.vcfed.org/index.php?threads/fanuc-pec-connectors-who-is-the-o… Martin

6 months, 2 weeks

7
15
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Fwd: SBC6128

by Doug Jackson

Hi Dave, I'll send this to the group, I suspect my email made it into your spam. Doug ---------- Forwarded message --------- From: Doug Jackson <doug(a)doughq.com> Date: Tue, 14 Jan 2025, 6:05 am Subject: Re: SBC6128 To: <dave.g4ugm(a)gmail.com> Hi Dave, I was just researching the IOB6120 (I had an 8 at the end of the model.. sigh - memory is often faulty) WOW - I had no idea that existed. I also had no idea that the community picked up Bob's designs and ran with them so enthusiastically - I feel like I have been under a rock for quite a while. I would be very very happy to purchase your board + IOB that you have put together - If the enclosure is not ideal, I am very happy to update that - these little boards are awesome. Just let me know a Paypal address and shipping details. Kindest regards, Doug Jackson em: doug(a)doughq.com ph: 0414 986878 Follow my amateur radio adventures at vk1zdj.net On Tue, 14 Jan 2025 at 05:37, Doug Jackson <doug(a)doughq.com> wrote: > Hi Dave, > > Thanks so much for that. > > Yes, postage is a pain, but necessary. > > If you are not using it, then the partially built one makes sense > (assuming you can find the programable logic and CPU). > > Failing that, then I don't mind paying the 250 Pounds for the built board > as long as it's complete :-) As I said, I was devastated. > > Are you able to double check and send me some photos. > > For a shipping address, I am at: > > Doug Jackson > 5 Pinschof Place, > Gordn, ACT, 2906 > Australia > +61 414 986878 > > Kindest regards, > > Doug Jackson > > em: doug(a)doughq.com > ph: 0414 986878 > > Follow my amateur radio adventures at vk1zdj.net > >

6 months, 2 weeks

3
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New DRAM (SIMM) board works but gives a parity error, only on cold powerup

by Anders Gustafsson

Hi! I have been mostly lurking here, but I have been designing a DRAM board for the HP1000 A-Series, using a more modern 72-pin SIMM. The A400 can adress 32Mb of parity ram so I use 17 bits on a 64Mb SIMM. I have taken inspiration from the original HP12103X boards and tried to keep away from esoteric parts. The board prototype works now and passes all tests, except that it gives a partity error in one of the first addresses (ie 2,7,10 octal) when booted cold. If I then run a %T it works fine, and also if I reset by bringing PON low. I have tested with different SIMMs and the two different types I have tested both exhibit the same issue. The 64Mb one has Samsung KM41C16000C chips. As this is for hobby-use, it is not a big deal as the board works, otherwise, but it is annoying. If anyone here, and I expect there are several that have worked with DRAM chips, have any suggestions on this issue or the board in general? Schematic is here:www.dalton.ax/hp1000/Memory/HP1000RAM_SIMM_Buffers_20241130.pdf Yes. I have also written protocol decodes for the KingstWiz LA5032 32-bit LA to analyse the HP memory bus if anyone is interested. -- Med vänlig hälsning Anders Gustafsson, ingenjör

6 months, 2 weeks

1
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DECtalk for Digital UNIX

by Cameron Kaiser

Anyone out there collecting Digital UNIX or Tru64 stuff? I'm trying to find the Alpha version of DECtalk V4.2A that ran on Digital UNIX. The readme file is easy to find but not the actual package. If you know where it is or have a good guess, I'd be much obliged (and so will this AlphaPC 164LX running Tru64 5.1B). -- ------------------------------------ personal: http://www.cameronkaiser.com/ -- Cameron Kaiser * Floodgap Systems * www.floodgap.com * ckaiser(a)floodgap.com -- The surest test of discipline is its absence. -- Clara Barton --------------

6 months, 2 weeks

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Not Try Algol 68 on Windows

by Lyndon Nerenberg (VE7TFX/VE6BBM)

Could we maybe change the subject headers here? Neither Fortran nor IBM terminal controllers has anything to do with Algol :-)

6 months, 2 weeks

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Re: Try Algol 68 on Windows

by Paul McJones

This sounds like FLACC (Full Language Algol68 Checkout Compiler) by Chris Thomson and Colin Broughton: "You know, we only ever got 22 copies installed, and less than 5 of those in North America. Even though it ran on 370's under MVS, CMS and MTS, and was cheap and reliable. Talk about a marketing disaster. " [Chris Thomson, comp.lang.misc, November 27, 1988] https://www.softwarepreservation.org/projects/ALGOL/algol68impl/#FLACC > Date: Mon, 13 Jan 2025 07:02:08 -0800 > From: "Lyndon Nerenberg (VE7TFX/VE6BBM)" <lyndon(a)orthanc.ca <mailto:lyndon@orthanc.ca>> > Subject: [cctalk] Re: Try Algol 68 on Windows > To: "General Discussion: On-Topic and Off-Topic Posts" > <cctalk(a)classiccmp.org <mailto:cctalk@classiccmp.org>> > Message-ID: <58bac767a09d3a37(a)orthanc.ca <mailto:58bac767a09d3a37@orthanc.ca>> > Content-Type: text/plain; charset="us-ascii" > > Mike Parr via cctalk writes: >> Hello all. >> Here is a link to something I wrote - brief intro to Algol 68's background, a >> nd how to run it on Windows - with a toy IDE as well. > > This triggers a fuzzy memory of an Algol 68 compiler running on > MTS at the U of Alberta, circa 1980. ISTR Chris Thompson at UofA > Computing Services had a hand in its development. > > Was this just a UofA thing? Did it escape to other MTS installations? > Did anyone use it to write substantial programs on MTS? Or was it > intended for Comp. Sci. teaching purposes? > > --lyndon

6 months, 2 weeks

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Re: Try Algol 68 on Windows

by donald donaldwhittemore.com

Yes, but punch cards did not have to worry about magnets. 😊

6 months, 2 weeks

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Re: FOCAL history

by Paul McJones

Note in his "FOCAL Notes and Background <http://www.softwarepreservation.net/projects/FOCAL/index#Merrill2024>”, Rick Merrill said: "Back in Maynard I took an editor, a floating point package and the specs for the JOHNNIAC Open Shop System (JOSS) and ideas from the Massachusetts General Hospital Utility Multi-Programming System (MUMPS) and wrote an interpreter that would do the user's job on the spot and interactively" > Date: Mon, 13 Jan 2025 10:33:46 +0100 > From: Hans-Ulrich Hölscher <vaxorcist(a)googlemail.com <mailto:vaxorcist@googlemail.com>> > Subject: [cctalk] Re: FOCAL history > To: "General Discussion: On-Topic and Off-Topic Posts" > <cctalk(a)classiccmp.org <mailto:cctalk@classiccmp.org>> > Cc: Mike Parr <mikeparr(a)live.com <mailto:mikeparr@live.com>> > Message-ID: > <CABG6mpaVHJWhECDiuxHZQcj+GwohHqqh9=HWJR0f2ooT+0PnPQ(a)mail.gmail.com <mailto:CABG6mpaVHJWhECDiuxHZQcj+GwohHqqh9=HWJR0f2ooT+0PnPQ@mail.gmail.com>> > Content-Type: text/plain; charset="UTF-8" > > Sorry, no: > BASIC 1963 > FOCAL 1968 > > Hans-Ulrich Hölscher <vaxorcist(a)googlemail.com <mailto:vaxorcist@googlemail.com>> schrieb am Mo., 13. Jan. > 2025, 10:31: > >> Isn't FOCAL older than BASIC? >> >> Mike Parr via cctalk <cctalk(a)classiccmp.org <mailto:cctalk@classiccmp.org>> schrieb am Mo., 13. Jan. >> 2025, 10:03: >> >>> I wondered about any influences from BASIC?

6 months, 2 weeks

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Re: Try Algol 68 on Windows (fwd)

by Lyndon Nerenberg (VE7TFX/VE6BBM)

[Oops. Forgot to cc the list the first time.]

6 months, 2 weeks

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Spare Time Gizmos SBC6128 PDP8 board

by Doug Jackson

Hi everybody, I used to own a SBC6128 which I built from Spare Time Gizmo's. It was a PDP8 on a chip, using a Harris 6128 PDP8 on a chip. It featured a serial port and an IDE disk interface. It was a heap of fun to use and recreated quite faithfully, my PDP8 that I had access to as a kid circa 1985... Sadly, I had to move a few years ago, and search as I can, I can't find it. I also can't find my HP41 HPIL cassette drive, printer and accessories but that's another story. Does anybody have a bare PCB or a built one that they don't use any more? I know I'm in Australia, but I don't mind paying postage. Happy to pay whatever you need.. Kindest regards, Doug Jackson

6 months, 2 weeks

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FOCAL history

by Bruce Ray

'FOCAL's history is now highlighted on the Software Preservation Group web site. Originally created for the PDP-8 in 1968, this simple, approachable computer language significantly expanded the use of early DEC minicomputers into applications not previously possible. It was embraced by users in an extremely wide range of applications, like education, psychology, aviation, medicine, to nuclear physics and process control. Read about the personal motivations and decisions that shaped this language and its wide-ranging impact at: https://www.SoftwarePreservation.org/projects/FOCAL -- Bruce Ray Wild Hare Computer Systems, Inc. Denver, Colorado USA bkr(a)WildHareComputers.com ...preserving the Data General legacy: www.NovasAreForever.org

6 months, 3 weeks

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Looking for S100 SCSI stuff

by Richard Cini

All — I haven’t posted to this list in the recent past, mostly posting to VCF or the S100 group. But, I’m trying to cast my net wide looking for some specific things for a project I’m working on. I’ve done recreations/clones of two Lomas S100 boards – the Color Magic and the Thunder 186 (https://github.com/RichCini/LomasBoards). This set creates a two-board computer that can run unmodified PC-DOS. While it’s PC-compatible, it’s compatible in the Tandy 2000 kind of way. I started work on the Color Magic about 2 years ago, pending reversing the PALs, which happened this year. The Thunder 186 was much easier to recreate, and thus was done in a few months. What this system currently lacks is a mass storage option. Lomas offered a SCSI board (which added an RTC and 4 serial ports), but copies of the manual and schematics aren’t known to exist on the Internet. There’s also a great alternative, the Lifeboat SCSI (for the Z-100 machines), but I haven’t been able to locate the software drivers or firmware for it (I have a manual which has the schematic and PAL equations). Finally, I can almost get Windows 1.0 running on this setup, but it needs custom drivers. I have the drivers from the Tandy 2000 (aka, the "Tandy 2000 MS-Windows Pre-Installation Disk") which don’t work as-is but I believe could with modifications. I posted to the Tandy Discord server but if anyone should know of the existence of these sources, please let me know. Thanks! Rich -- Rich Cini http://cini.classiccmp.org

6 months, 3 weeks

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PDP-10 TENEX mini-dump format

by Chuck Guzis

I've got a 7 track tape here that was written on a PDP-10 TENEX setup. It's identified as a "mini-dump" tape. I can extract the data (PDP-10 5 char/word) successfully, but the format of the block headers (seems to be about 6 words) eludes me. I'd like to be able to use the original file names. Does anyone have information on the mini-dump structure? TIA Chuck

6 months, 3 weeks

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Re: [PiDP-11] A propere RDBMS for RSX-11M+

by Ed Groenenberg

Hello Mark. The Oracle V2.3 manual is only partly usable for 4.1.4. The build/install scripts copies a help file to [1,1] and you only need to add the keyword and reference to the help file in mcr.hlp and dcl.hlp. Yhos help file is mucht more usefull. If you used the newsinst.cmd file after the installation, it will create a demo database (scott/tiger), which has several similarities compared to V2.3. Main difference for UFI, in v2.3 it is 'ufi personnel scott/tiger' whereas in V4 it is 'ufi scott/tiger' for the basic demo. Ed -- Ik email, dus ik besta 😆 January 2, 2025 4:26 PM, "Mark Matlock" <mark(a)rsx11m.com> wrote: > Ed, > Congrats to both you and Johnny on bringing this Oracle software back from extinction!! > > I was a big fan of Datatrieve but haven’t worked with Oracle before. I downloaded the V2.3 manuals > and have started reading them, but I ran into a question. To use the UFI, one needs to login with a > user name and password. Is there a default one or how do you set one up? I configured my > installation for two users. > > Thanks for this great software archeology development! > Mark > >> On Dec 31, 2024, at 5:59 PM, Ed Groenenberg <ed(a)groenenberg.net> wrote: >> >> The wait was long, but it's finally available, Oracle V4.1.4 for RSX-11M+. >> More at www.oracle-v2.online/oracle414 >> >> Ed >> -- >> >> -- >> You received this message because you are subscribed to the Google Groups "[PiDP-11]" group. >> To unsubscribe from this group and stop receiving emails from it, send an email to >> pidp-11+unsubscribe(a)googlegroups.com. >> To view this discussion visit >> https://groups.google.com/d/msgid/pidp-11/f3fe33a34335d8f9bb9daa30ca0a36f0@…. > > -- > You received this message because you are subscribed to the Google Groups "[PiDP-11]" group. > To unsubscribe from this group and stop receiving emails from it, send an email to > pidp-11+unsubscribe(a)googlegroups.com. > To view this discussion visit > https://groups.google.com/d/msgid/pidp-11/46350799-AC28-4EBD-B890-0955A5083….

7 months

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Re: I need some RSX11M+ TKB help

by Mark Matlock

Peter, The command file below is from a SYSGEN driver build of DDDRV from my system but I think it should work for yours. Note that OU: is defined by the SYSGEN process and should be set as a logical to your system disk (DL0:) or perhaps more simply just edited to be SY: Also, note that it uses RSXVEC.STB which should work on the pregenned RL02 RSX11M+. [200,200]DDDRVBLD.CMD ; ; DDDRVBLD.CMD -- RSX-11M-PLUS loadable DD: driver build command file ; ; Created on 01-NOV-2024 at 14:00:05 ; OU:[1,54]DDDRV/-MM/-HD,SY:[1,34]DDDRV/SH/-SP,OU:[1,54]DDDRV= SY:[1,24]RSX11M/LB:DDDRV:DDTAB LB:[3,54]RSXVEC.STB/SS LB:[1,1]EXELIB/LB / STACK=0 PAR=DRVPAR:120000:20000 / If for some reason you need to assemble the DDDRV driver below is the SYSGEN produced assembly command files. [200,200]DDDRVASM.CMD ; ; DDDRVASM.CMD -- RSX-11M-PLUS loadable DD: driver assembly command file ; ; Created on 01-NOV-2024 at 12:56:02 ; OU:[11,24]DDDRV,LS:[11,34]DDDRV/-SP=IN:[1,1]EXEMC/ML,[11,10]RSXMC/PA:1,DDDRV OU:[11,24]DDTAB,LS:[11,34]DDTAB/-SP=IN:[1,1]EXEMC/ML,[11,10]RSXMC/PA:1,DDTAB Good Luck, Mark > > 1. I need some RSX11M+ TKB help (Peter Ekstrom) > > From: Peter Ekstrom <epekstrom(a)gmail.com> > Subject: [cctalk] I need some RSX11M+ TKB help > Date: December 29, 2024 at 6:21:46 PM CST > To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk(a)classiccmp.org> > Reply-To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk(a)classiccmp.org> > > I have RSX11M+ 4.6 BL87 installed and running on my real PDP 11/23+ and > have gotten DECnet to work as well. But recently a need to access a TU58 > tape has come up, and turns out the DD driver on disk isn't built against > the correct RSX11M.STB file. So I need to, I guess, recreate the DDDRV.TSK > file. I have tried some very simplistic TKB commands but keep getting an > error saying a required file is missing. > > I don't have the sysgen stuff on this disk... What I have comes from the > pregenned RL02 image. > > Does anyone know how the TKB command line should look for this? I know, I > am looking for the easy way out. I have skimmed through some manuals but > nothing has stood out to me (I'm sure I missed it). > > Any help would be greatly appreciated. > > - Peter

7 months

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Rainbow Z80 firmware

by Rob Jarratt

Hello everyone, I am working on a Rainbow 100A which is showing a diagnostic code on the lights at the back of 0110101. This is supposed to be Message 1 "Main Board Video". I have disassembled the 8088 firmware and checked address traces with a logic analyser and my suspicion is that actually this is something to do with the interaction with the Z80 because it is reading a status from the shared memory and then using that to set the status lights. I have been unable so far to work out where in the ROMs the Z80 code lives or where in the 8088 code it transfers it to the shared memory to allow the Z80 to run. Can anyone tell me where the Z80 firmware is in the ROMs? And does anyone have any insight into the above error or have details of the interaction between the Z80 and the 8088? The Technical Manual only goes so far unfortunately. Thanks Rob

7 months

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Print chain for 1403

by Van Snyder

The IBM 1403 printer had interchangeable print chains. I know of only four 1403 printers still working — two at the Computer History Museum in Mountain View, CA, one at the IBM Technology Center in Böblingen, Germany, and one near Endicott, NY. All four have the 48-character "A" or "Business" chain, and CHM has a 16-character numeric chain that allows the printer to run twice as fast for numeric-only output. CHM doesn't have an "H" or "Fortran" chain, and as far as I know, none of the others do. The difference is that parentheses are % and "lozenge" — a square with indented edges — apostrophe is @, and = is # on the "A" chain. IBM also had a 64- character chain that included box and line drawing graphics. BTW, nobody seems to know what "lozenge" was meant to represent. Does anybody know of an existing "H" chain or graphics chain for a 1403? Van Snyder

7 months

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I need some RSX11M+ TKB help

by Peter Ekstrom

I have RSX11M+ 4.6 BL87 installed and running on my real PDP 11/23+ and have gotten DECnet to work as well. But recently a need to access a TU58 tape has come up, and turns out the DD driver on disk isn't built against the correct RSX11M.STB file. So I need to, I guess, recreate the DDDRV.TSK file. I have tried some very simplistic TKB commands but keep getting an error saying a required file is missing. I don't have the sysgen stuff on this disk... What I have comes from the pregenned RL02 image. Does anyone know how the TKB command line should look for this? I know, I am looking for the easy way out. I have skimmed through some manuals but nothing has stood out to me (I'm sure I missed it). Any help would be greatly appreciated. - Peter

7 months

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FTGH IBM 4245 Printer Bands

by Joe George

Anyone have an IBM 4245 printer? I came into a box of NOS print bands and have zero use for them. Don't want to hard them, don't want to throw them out. FTGH, pitch in a couple of bucks for shipping and they're yours. I can get part numbers and quantities if there's interest. There's about a dozen of them and I think they're all the same belt, but do not know for sure.

7 months, 1 week

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VCF East 2025 - April 4-6, Wall, NJ - Exhibitor Registration

by Jeffrey Brace

VCF East 2025 Exhibitor Registration is open: https://docs.google.com/forms/d/e/1FAIpQLSedyn-m5gSCc0Sifce0O_HnVYtWu7s9u7D… The show will be April 4-6 in Wall, NJ @ InfoAge Science and History Museums Check the web page for updates over the next few weeks https://vcfed.org/events/vintage-computer-festival-east/

7 months, 2 weeks

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very old UNIXes software, contact at typewritten?

by jfsebastian＠null.net

Hello I have been doing a several years effort to save (very) old software for posterity, researchers, students. Mostly early 90s UNIXes, SunOS, Solaris, DG-UX, HP-UX, AIX, DEC-UNIX, some VMS software even. I uploaded some things to the Archive, and elsewhere, but I would rather get this off my shoulders, for mortality affects us all. This vanishing would be a loss, with many of these things are nowhere to be found anymore. I tried contacting the admin(?) bear at typewritten dot org, offering a few things for archiving, without results. Do any of the users here have any means to contact the admin there? I would very much like to access some of the UNIXes software there, and would gladly offer a quid pro quo. Similarly, if you have any software for Solaris (2.6, earlier) and other UNIXes, regardless of licensing status, I would be very much interested. Some things probably are lost forever though, such as Proliant PL/I, VisualWorks 2.5, Tibco S-PLUS, Harlequin WebWorks and such. Thanks in advance, and all the best Seb.

7 months, 2 weeks

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Digital lemac (de203) datasheet?

by Kevin Bowling

Was a datasheet ever offered for the DEC 'lemac' series (de203/de204/de205)? Like the thing with all the registers and programming information not the installation guide. Regards, Kevin

7 months, 2 weeks

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Trouble with DEQNA adapter

by Peter Ekstrom

Hi all, This may be a dumb question but I am a bit stumped. I can't seem to find any helpful info in the manuals. I have a DEQNA installed in my 11/23+ and I have run a NETGEN using the QNA driver. When NETINS runs I start seeing messages like these on the console: Event type 5.14, Send failed Occurred 19-DEC-24 09:30:11 on node 10.1 (TYCHO) Line QNA-0 Failure reason = Collision detect check failed So obviously the link isn't working, but I find nothing helpful about where to start looking regarding the failed collision detect check. The line is on: NCP>show line qna-0 status Line status as of 19-DEC-24 09:36:31 Line State QNA-0 On I have an Ethernet transceiver (I have 2 and have tried both, they worked last time I used them) connected to the DEQNA harness, and a cable connecting it to an old 10Base-T hub. I know that hub works because I have a couple of other systems (OS/2 laptop and an AS/400) connected to it. So does anyone have any ideas of where I can start? Thanks in advance! Peter

7 months, 2 weeks

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Any Burroughs B5000/A Series NEWP programmers out there?

by Alan Perry

Hey, Did any of you do NEWP programming on Burroughs/Unisys A Series systems? I will be attempting to put together some presentation material (for VCF or similar talks) on MCP internals programming. However I haven’t done it since 1989, so am looking for others who have experience in this area to help me remember details. I took the MCP internals class and still have the class exercises and my notes. Recently a A12/A15 Hardware Operations manual popped up on eBay. I scanned it and submitted the scan to bitsavers. I am hoping to get my hands back on some system architecture documents that I once had. So, if anyone here worked on this stuff and wants to help out on this, let me know. alan

7 months, 2 weeks

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From Punch Cards to Python Grace Hopper’s A-0 compiler paved the way for modern programming languages

by Christian Liendo

From Punch Cards to Python Grace Hopper’s A-0 compiler paved the way for modern programming languages https://spectrum.ieee.org/from-punch-cards-to-python

7 months, 2 weeks

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List problems

by Christian Corti

Basically, this message is just a test. The list server seems to be utterly buggy and broken at the moment. What is the reason? Christian

7 months, 2 weeks

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List problems

by Christian Corti

And worse, I do see some messages in the Mailman frontend, but I don't receive any email from the list server any more. Christian

7 months, 2 weeks

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Re: Seeking Remex RRS3300 Paper Tape Reader info

by David Wise

If anyone has info on this model, please reply or contact me. Thanks. I recorded video of my RRS3300 reading and winding. Since my initial post, I discovered that the machine needed even more civilizing, and I ended up reducing the reeler speed from 200IPS to 100IPS. Link here: https://www.youtube.com/watch?v=dmWAguLki6o . The spiral-wrapped cables at the top go to a microcontroller, which reads the sprocket-hole signal and retards the phase control ramp. [https://www.bing.com/th?id=OVP.qNKj3Byj-dGoXSwjoQbt0AHgFo&pid=Api]<https://www.youtube.com/watch?v=dmWAguLki6o> Remex RRS3300 Paper Tape Reader<https://www.youtube.com/watch?v=dmWAguLki6o> Demonstrating my Remex RRS3300 paper tape reader, made in 1970 with discrete/TTL/DTL technology. The 300cps reader section uses capstan drive and electromagnetic brake instead of a stepper and pinwheel. The spooler is permanent split capacitor AC induction motors, electromagnetic brakes, relays (mechanical and discrete solid-state ... www.youtube.com

7 months, 3 weeks

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QIC Archival

by Cameron Kelly

Hello, I have a QIC tape of an interesting piece of software that doesn’t seem to be archived anywhere. I don’t have experience using QIC tape so I’m inquiring if anyone here would be willing to offer the service. The software in question is “CorelDraw For Unix”. Thanks, Cameron

7 months, 3 weeks

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IEEE Spectrum: When IBM Built a War Room for Executives A new video captures a remarkable 1968 demo of IBM’s Executive Terminal

by Christian Liendo

As time goes on new things are found. When IBM Built a War Room for Executives A new video captures a remarkable 1968 demo of IBM’s Executive Terminal https://spectrum.ieee.org/ibm-demo

7 months, 3 weeks

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Re: Information on Trend UTR 700 Paper Tape Reader and Facit 4060 Punch

by Malcolm Clark

Hi Martin, I am looking for a manual for the above tape reader and found your details from a discussion on cctalk from July 2022. I am a volunteer at The National Museum of Computing and an ex Ferranti engineer. I am currently restoring an Argus 500 computer and trying to get it back to its original configuration. I have recently restored 2 Trend HSR 500 readers and now have acquired 2 UDR 700 readers that need to be fixed and set up. My latest video on YouTube https://youtu.be/8HtRqe6jzc8?si=MmRL4qbh_7PZjVff In the email you said you had scanned the document into a file. Would it be possible to upload it to Google Drive and send me the link so I can download it? Ultimately I would like to upload it to the Museum archive and make it available for everyone to view. I am assuming that there are no copyright issues as Trend was finally wound up as a company in December 2022. Hope to hear from you soon Kind Regards Malcolm Clark

7 months, 3 weeks

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Old mainframe humor

by Donald Whittemore

NEAT/3 instructions www.myimagecollection.com/webdocs/neat3.pdf Misc instructions www.myimagecollection.com/webdocs/pl-o.pdf Misc Assembler www.myimagecollection.com/webdocs/miscassembler.pdf IBM beginnings www.myimagecollection.com/webdocs/beginning.pdf New IBM OS www.myimagecollection.com/webdocs/newibmos.pdf

7 months, 3 weeks

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Re: VT-100 Text Windows library

by Henry Bent

If this were my project, I would start by getting newlib going and then seeing if I could use that to run an older (presumably more simple, with fewer requirements) version of screen. -Henry On Mon, Dec 9, 2024, 22:04 Mike Katz <bitwiz(a)12bitsbest.com> wrote: > Overlapping would be amazing, different screen quadrants at a minimum. I > am going to try to port Txwindows as that is the only package I could find > > On Dec 9, 2024 8:40 PM, Henry Bent <henry.r.bent(a)gmail.com> wrote: > > On Thu, 5 Dec 2024 at 20:26, Mike Katz via cctalk <cctalk(a)classiccmp.org> > wrote: > > Thank you. > > Screen is a linux utility. I am writing this on a bare metal (no > operating system) ESP32 dev board. > > Right now the program is text menu driven. I would like to enhance it > with textual windows. > > The Txwindows package is perfect but over kill and will need some > hacking to work in my environment and it doesn't support the VT-100's > region scrolling so screen updates might be slow. > > > What might be helpful is if you could be more specific about what it is > you're trying to achieve. Do you want arbitrarily sized, overlapping > windows or do you just want the screen divided up into discrete segments? > > -Henry > > >

7 months, 3 weeks

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Sequent RAM identification help

by Aaron Taylor

Hello, While cleaning my garage I ran across 100+ sticks of RAM that I can't identify. Does anyone recognize these? Are they of use to anyone? https://imgur.com/a/xUnBuEg Note that there are two types of RAM in the photos and they have different keying notches in the middle of the connector. One has a PCB copyright of 1997 and the other is 1999. Both are marked "Sequent Computer Systems", and are buffered, ECC, 256 MB, 50 ns, EDO RAM. Aaron

7 months, 3 weeks

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Philips P2000C disk format

by Tony Duell

The quick version : Does anyone know the exact physical and logical disk format used by CP/M on the Philips P2000C portable computer? The long version with explanations : I am having reasonable success transfering files to/from disk images for my Osborne 1A (using cpmtools) and IBM5155 (MS-DOS, of course using editdisk). And I've even got the Greaseweazle to transfer those images to/from real floppies. The Greaseweazle still annoys me in that I know it's capable of a lot more if only I could work out how to do it, but at least it does something useful [The less said about floppy disks shedding oxide and/or suffering from 'sticky shed' the better. I'm spending far too much time dismantling and cleaning drives....] Any, I'd like to do the same for another of my machines, a Philips P2000C cp/m 'portable'. My machine is the version with 2 internal 40 cylinder single head drives (about 160K each, MFM) but I can also plug in an external 80 cylinder double head drive to handle this machine's other native format (about 640K). Unfortunately, this machine is not common, and neither cpmtools nor the greaseweazle software has the formats predefined. I could add them myself -- if I knew what they were. Things like #sectors/track, sector size, #system tracks, skew, etc. It's not obviously given in any of the manuals I have, so does anyone know it before I try to work it out. Alternatively there are rumours that the P2000C could read/write at least one more common cp/m disk type. The hardware should be capable of it, sure. Doe anyone know if software to do something like this exists anywhere for the P2000C. I can't find it on any of the obvious sites -tony

7 months, 3 weeks

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A bit of humor to test the list

by Fred Cisin

They seem to have upgraded the video output! > I found the picture on the front page of this web site humorous. It's a > place that sells old Jeep parts. Note the computer surfing the web. > https://www.kaiserwillys.com/

7 months, 3 weeks

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Cleaning Card Punch

by David Wade

Folks, I have been trying to restore a manual card punch. The type with 12 "Buttons" or "Plungers" that operate a lever which pushes a punch "pin" through a die to create a hole in a card. Its almost identical to this one:- https://www.computinghistory.org.uk/det/38019/ICL-Hand-Key-Punch-Card-Machi… so despite lots of cleaning some of the pins stick down. Does any one have any suggestions how to clean the small square slots? Any idea how the holes were made? Dave G4UGM

7 months, 3 weeks

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European wire size (slightly off topic)

by Charles Dickman

How are small wire sizes specified in Europe? I have seen that EN 60228 defines wire cross sections down to 0.5mm2. What about smaller than that? Does the standard go smaller? Stranded wire must consist of smaller solid strands. -chuck Off topic, but perhaps edifying for all.

7 months, 3 weeks

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List outage

by Dennis Boone

Folks, Apologies for the list outage. Jason thinks this has been going on since roughly 11/16. I guess the sense of relief at no inbound list emails kept me from realizing there were no list emails. :) I think it's better. Will keep an eye on it. De

8 months

2
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A bit of humor to test the list

by wrcooke＠wrcooke.net

I found the picture on the front page of this web site humorous. It's a place that sells old Jeep parts. Note the computer surfing the web. https://www.kaiserwillys.com/ Will

8 months

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Passing of T. Kurtz

by Murray McCullough

Today another giant in the ‘microcomputer’ industry has passed: Thomas Eugene Kurtz a computer scientist, co-creator/inventor with John Kemeny of the BASIC language that I grew up with. Somewhat dates me! Happy computing, Murray 🙂

8 months, 2 weeks

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The 8086

by Murray McCullough

To my knowledge Intel announced the C8086 processor in Nov. 1978. This processor set the stage for the current technological age. It continues to adapt and its future seems bright! Happy computing, Murray 🙂

8 months, 2 weeks

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Date of IBM 1/2" tape from factory number

by Chuck Guzis

Dear list denizens, I've got a mental itch that needs to be scratched. Before me sits a yellow 3-hole reel of IBM 556 bpi 1/2" tape. Fortunately, the leader is intact and carries the number H241032488. Does this perchance give any clue as to when the tape was manufactured? I know that IBM still carried 556-tested tape in their catalog as late as 1966. Any clues? Thanks, --Chuck

8 months, 3 weeks

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Fanuc A860-0056-T020 : 24 V supplies

by Martin Bishop

Bill A few years ago I took your advice on interfacing a Fanuc tape reader without reels, it has happily read tapes to its host since then. The interface card was the common A20B-007-0750/07B, with 24V, 5V & Gnd on CNT3, and IO signals on CNT1. Notably the 24V currents can be high, eg 1A2 when in auto. I now have a Fanuc A860-0056-T020 tape reader with reels on the bench and know that several years ago you used the same model. Two specific questions: - does the CNT1 connector harbour any surprises ? I presume at worst it is a superset of the A20B-007-0750/07B CNT1 interface - how did you feed 24V into the beastie o via CNT1 p23 and p24 ? ie on two ribbon cable cores o I note that TP2 provides 5V/Gnd terminals, but 24V has no terminals ? The Fanuc 6T "manual", helpfully available on your web site, indicates (Fig 3.6a) that the tape readers (with/out reels) are fed 24V and 5V over the ribbon cable. And, that the with reels motors run at 100V. I would be very grateful for an indication of how you implemented the power hook up and intimation of the currents / power levels to be expected. Hopefully, knowledge will keep the magic smoke inside the system. Best Regards Martin

8 months, 3 weeks

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Looking for Sharp PC-5000 disk drive (CE-510F or possibly MZ-80B)

by Steve Lewis

A while back I started studying more about the Sharp PC-5000 (and had it up and running at VCFSW in 2023). I'm now coming back to that project, and one thing I was never able to find was a compatible 5.25 disk drive. I've collected some information about this system at here: https://voidstar.blog/sharp-pc-5000/ And I am hoping to put together a video about out. But one challenging aspect is that its LCD screen is difficult to record (lots of reflections). And despite having lots of schematic documentation now, I'm still not savvy enough to try to export its screen content to an external device that might have a backlight. From my notes, as I recall.... The 37-pin connector at the back of the PC-5000 is not the same as the 37-pin connector at the back of the IO card with the original IBM PC 5150. I believe the Sharp product model number I am looking for CE-510F (which might be the same as MZ-80B in certain markets). This isn't an urgent thing - the Bubble Memory modules of this PC-5000 are still all working fine and make the system functional. But I do have a set of disk with the system that might be interesting to try out. So just broadcasting here, on the off-chance someone might be familiar with these and know of a stash of accessories (most likely within a Japanese-speaking community, where I think Sharp products were generally more popular). Thanks! Steve v*

8 months, 3 weeks

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looking for HP 1640B GPIB info

by Sytse van Slooten

Hi all, I have a HP 1640B that I'm trying to get to work. However I can't find any information about it, and while the machine itself it straightforward enough (and I remember enough from when I was using it in my first dayjob) I can not find anything about how to use the GPIB interface that it has. The reason I'm interested is, we've finally managed to add GPIB support to the PDP2011-MINC fpga implementation, and I'd like to test against a different target than the relatively modern Philips/Fluke counter I'm now using. And the 1640B is the only other GPIB instrument I have... The HP doesn't seem to know the ID? command (that causes an error message on the screen). It does respond to a newline (the standard is-this-listener-present test that the MINC code implements), so at least something is working. Does anyone here have any docs on the HP 1640B? It'd be very helpful at least to know which GPIB commands are implemented. thanks in advance! Sytse

8 months, 3 weeks

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CDC 152 Logic Card Tester

by hupfadekroua

Hello All, I got a CDC 152 Logic Card Tester. This one does have some kind of a patch panel to configure the cordwood module test procedure. I did not find any reference to this unit as well as documentation while querying the internet. Any hints to docs? Best Andreas

8 months, 3 weeks

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System 360 question

by Donald Whittemore

If I remember right I was told back in the early 70s by our IBM CE that physical damage could be done to our model 30 or 40 if we ran a program that did an Assembler instruction, B * For those non-Assembler people that is an instruction to branch to the location of the instruction. I think it might have caused a heat problem in the core or CCROS or TROS. Possible? Or is my 76 year old brain hallucinating?

9 months

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Innovations

by Murray McCullough

A lot happened in the computer industry in early Nov. in the past: Intel's x86 PC architecture was born; lo & behold Windows ME was released upon the world; for the corporate in us the IBM Portable Computer was introduced. The PC world hasn't been the same since. Happy computing, Murray 🙂

9 months

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Ward Christensen NY Times Obituary

by Robert Feldman

Ward Christensen, Early Visionary of Social Media, Dies at 78 https://www.nytimes.com/2024/10/21/technology/ward-christensen-dead.html?un…

9 months

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RQDX3 Formatter

by Peter Ekstrom

Hi everyone, Does anyone have the source for the ZRQCxx formatter? I have found a pdf for ZRQCE0 but am curious if the actual source code for that one, or ZRQCH0 is available? I'd like to make some changes to the UIT table. -Peter

9 months

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Re: System 360 question

by donald donaldwhittemore.com

Glad I never tried it. 😊

9 months

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OS2 on a ThinkPad

by Steve Lewis

You'd think an IBM operating system on an IBM ThinkPad would be easy-peasy - but good grief, it's taken me over a year to finally get a magic formula that works. Not too new, not too old.... (and yes, I have ArcaOS too, but I wanted an OG 1994 install) One interesting thing I found is that OS/2 can actually run SecondReality (in full screen, but it suspends it when I ALT-ESC to something else) -- including with SBPro audio. I couldn't do that with WinXP yet (same hardware), even though trying explicit DOS settings. I may tinker some more on that, but rebooting to "MS-DOS Mode" in 95/98 can changing EMM386 from NOEMS to RAM then SR works. I'll do a write up on the adventure soon-ish, I'm still trying to figure out the TCP/IP settings stuff for OS/2. My first experience on the Internet was "borrowing" my sister's credit card and racking up $100 for an afternoon of web-surfing on dial up, with OS/2 Warp in 1994. A graphical Traceroute was so neat to see, a graphical Gopher, and some early web sites. Frankly, that day I fully realized that "BBS's are done for" (or cute ANSI couldn't compete with HTML). I paid my sister back, eventually. At the time I thought it was just an activation gate, didn't realize there was a per-minute charge. Sorry sis! Don't leave your card out on the table :P -Steve

9 months

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Old TMS3202x Software?

by Holm Tiffe

Hi guys, I've got a bunch of TMS32020 and two TMS320C25 Chips and I want to play with them a little :-) Is the old DOS (orf VMS?) Software still available from somewhere? (Yes, I have an VS4000-90 under the desk..long time ago since I've last booted it, but ...simh also exists). I'm looking for assembler, linker and the simulator that was abailable when those chips came out (1986...) but I can't find any occurences of that old stuff anymore. Was a C compiler available for those old DSP's? Regards, Holm -- Technik Service u. Handel Tiffe, www.tsht.de, Holm Tiffe, Goethestrasse 15, 09569 Oederan, USt-Id: DE253710583 info(a)tsht.de Tel +49 37292 709778 Mobil: 0172 8790 741

9 months

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Re: Identify 14" HDD with two heads on single arm

by Evan Linwood

Sorry you'll notice also on the lower half of the front is an aluminium cover that detaches with a couple of screws, revealing another card with additional labelling on it. Also have a look around the inside of the case. Any of those thin, printed strips are where you'll likely find one (or more) of these 005- series numbers. On my unit, the '6098-4' label can be seen on the external rear of the machine, adjacent to and below where the label describing the power characteristics is located.

9 months, 1 week

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Re: Identify 14" HDD with two heads on single arm

by Evan Linwood

Hi Paul, Actually I've got a couple of these units, and as Bruce has indicated yes they're a Data General manufactured product. (Bruce is the one with vastly more DG knowledge than myself). Mine is a '6098', which is really an integrated combination of fixed disk drive, floppy disk drive and controller card. As Bruce has mentioned there will also be the internal DG product number, prefixed with 005, on it somewhere (it's possible yours isn't exactly the same model as mine). This manual is up on Bitsavers: http://www.bitsavers.org/pdf/dg/disc/Disc_Subsystem/014-000638-00_6097_6098… DG manufactured drives up through 300MB removable pack type drives, and fixed drives with capacities into the multi-GB area (used in MV series systems).

9 months, 1 week

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Identify 14" HDD with two heads on single arm

by pbirkel＠gmail.com

Can anyone identify the 14" HDD seen in the following photo (not mine)? It's unusual in that there are two moving heads on the top surface of the platter. I presume that there's a fixed head on the bottom surface for the clock track. This is from a Data General 6100 disc subsystem which is advertised as 25MB capacity. There's a related model with half that capacity. https://forum.vcfed.org/index.php?attachments/img_5116-jpeg.1288418 The only thing that I can say for sure is that it's visually not a Shugart SA4000 and that exhausts my knowledge on the subject.. While I presume that the 25-signal twisted-pair ribbon cable is for control signals, there is also a 16(?) line grey ribbon cable connected to the left side of the DG-specific power control PCB. I'm guessing that would be data/clock lines from hidden electronics where the 25-signal twisted-pair ribbon originates; not sure what else may be then happening on the DG-specific power control PCB. Thank you for any insights into manufacturer, model, and documentation. -paul

9 months, 1 week

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GE Mark I/Mark II Timeshare Systems

by Rick Bensene

Hello, all, I know that there has been great effort to gather up and make available via emulation (SIMH) timeshared Operating Systems for DEC machines, as well as Hewlett Packard 2000-Series Timeshared BASIC systems, but I was wondering if there has been any efforts made to archive and perhaps emulate any versions of General Electric's timesharing systems? GE's architecture was similar to Hewlett Packard's timeshared BASIC (2000A, C, C', F, /ACCESS) in that there was a main computer that took care of managing the user-space and running user programs, and a communications processor that acted as the front-end that did the terminal services handling. At one point, GE's timesharing system service was the largest timeshared computing service bureau out there, getting an early start in timesharing out of the timesharing research done at Dartmouth, as GE computers were used in this research. The GE timeshare service had local dial-up lines in most major cities, and eventually were connected into Tymnet, further adding to the places where a local dial-up number could get you into any of a number of different GE timeshare systems that were connected to the network. Has anyone done work on emulating any of GE's processors (200-series, 400-series, DATANET machines) that were used in the Mark I and Mark II timesharing systems? GE's place in timesharing history is quite significant, and seems certainly deserving of efforts to procure and preserve the code, and perhaps make it live on through emulation. However, GE being the huge entity that it is (and was back then), getting hands on the code as well as permission to do anything with it could be a challenge that may have been attempted and failed who knows how many times over the years. I'm just wondering if anyone out there may have old listings, mag-tapes, or card decks laying around that have the source(or binary distributions) for any of these GE timesharing systems? If, so, any such media should certainly be put in the hands of an entity that can assure that they are preserved, and perhaps at some point, made available online so that others who may have interest could begin work on emulating these systems. I thought of this today because an old memory came to the fore out of the blue. The memory is very clear despite the many years that have elapsed since then. It is as clear in my mind as it was the day it happened. I have no idea why it has stuck so clearly in my mind. Back in high school, there was a service man that would come in to repair/tune-up the Teletype model 33-ASR's we used to dial into the school district's HP Timeshared BASIC system. These machines were heavily used by students who didn't always treat them gently, and the 33-ASR's weren't really designed for the use they were exposed to, so he would come in frequently to fix machines that had broken down. After he had worked on a Teletype, he would dial-in to some kind of timeshare system with a local phone number and run some test programs to validate the proper operation of the terminal. and then log his work by running a BASIC program that would ask him questions about the job, and he'd fill in the answers. One day, I happened to be working at a Teletype next to the one he was working on, and he had just finished up his work on the machine. He and I had chatted numerous times in the past, so he was comfortable with me, as I was with him. I watched as he dialed up the phone number for the system and I memorized it as he dialed it. I also watched as he entered his account to log into the system. It was IBB00999, and the password was "INFO". I couldn't see the print out from my angle, so I had to watch his fingers as he typed in the information. I tried to be as inconspicuous as possible while watching him, but he made no attempt to block my view or otherwise keep me from seeing what he was doing. He always made a point of taking the printout of his session with him rather than leaving it on the machine or tearing it off and tossing it in the trash. I figure that was a security measure as the at least the user ID would be listed on the paper. But, it didn't stop someone from watching him enter the information. I had become pretty good at watching people's fingers on the keyboard to figure out what they were typing. After he had finished his work, I dialed up the system, and when it asked "USER NUMBER--", I typed in "IBB00999,INFO", and pressed [RETURN]. I guess I had observed what he'd typed correctly, because then the TTY clattered out "SYSTEM--", which I did not happen to note the service man's answer to this query, but I figured it wanted to know what language to use, so I typed in "BASIC", and hit [RETURN]. The system then said "NEW OR OLD--", and since I didn't know what programs were already in the directory, I typed in NEW, and then pressed [RETURN]. I was then greeted with "READY". I'd seen this NEW/OLD used on a DEC RSTS/E system, so I knew it meant either to start fresh with a new program, or if OLD was typed, it'd want to know the name of a program to load from the catalog. I typed in a simple BASIC program, something like generating a listing of numbers and their square roots from 1 to 100, and typed "RUN", and it paused for a short time, then began rattling off the list of numbers. I got nervous, though, and logged out after the program finished (I didn't know how to stop it, though I later figured out that pressing the [BREAK] key would work, just like it did on the HP Timeshared BASIC system. Over the following days, I logged into the system and played with it here and there, making sure to only log short sessions so as not to rack up too much time, as the company that the service guy worked for may have been charged for the online time. I never stayed logged in for more than perhaps 10 minutes at a time, and the programs I tried didn't chew up much in the way of resources. I didn't save any programs, nor did I try to do anything that would leave traces of my visits, other than the fact that I had dialed in and logged in. The system seemed to have a FORTRAN subsystem also, and I was able to enter a small FORTRAN program and RUN it, which was kind of cool. I had learned FORTRAN by taking a class at a local community college that had an IBM 360/30, so I knew enough to be able to enter a simple FORTRAN program and try it out. I thought it was really cool that this system could do both BASIC and FORTRAN. I tried to see if it had COBOL (which I had also learned by taking another class at a community college), but alas, it did not. I don't know if the languages on the system were interpreted, semi-compiled (into pseudo-code which was then interpreted), or fully compiled into machine code. I do know that when you typed RUN to execute a program, the system would pause for some time before execution began, so there must have been some kind of processing going on that could have been compilation of some form. I remember that the system seemed to be quite a bit more responsive than the HP 2000C Timeshared BASIC system the school had access to. It would generally respond to commands immediately, while sometimes the HP system would pause a bit before anything happened. Admittedly, I knew that our HP 2000C system was very busy all the time during the school days as it was shared by quite a few different school districts in the county. I had no idea how many users may have been on the GE timeshared system. It would take longer on the GE system after you typed RUN on a BASIC program before the program started executing, but once it did, it would rip through the program considerably faster than the HP system, especially when it came to doing lots of math. I once entered a program that would calculate factorials, and I ran the programs side by side, one on the HP 2000C, and the other on the GE timeshared system (I didn't know it was a GE system at the time, but figured it out later). I gave the GE system a little head-start because of the processing before the program ran. The program would generate a list of integers and their factorials from 1 to 40. As the numbers got larger, the HP timeshared system would print out the integer and some spaces, then stop for a bit, taking longer as the factorial was computed, and then print the factorial. The program was the same on both systems, but the GE system never paused during the output, and finished just under a minute faster than the HP system. I didn't have any manuals or other documentation for the system, and so I just had to trial-and-error my way through. I'm sure I didn't even begin to scratch the surface of the capabilities of the system, but it was nonetheless interesting to poke around in a system that was different than our timeshare system. After I had tinkered around with it intermittently for a few weeks, I ran out of things to try, and stopped playing with it, partly out of worry about getting caught somehow. A few months later, I thought about it again, and when I tried to login, it appeared that the user had been deleted or the password changed. Perhaps my tinkering had showed up as a larger than usual bill for services, and that resulted in the change. Or, maybe it was policy to change the user/password every so often. It was fun to explore while it lasted. The Teletype service guy would be much more careful when he was dialing up the system and entering his userID/password, and would ask anyone nearby to please turn away while he was connecting up to the system. I have no idea if it was my tinkering that caused this change in behavior, but if I was nearby, I would comply with his request, so I never got a chance to gather up another userID/password. Some years later, my father's business, which was a precision machine shop, had an account on a GE Timeshare System that had the "APT" "part programming language" that was used to describe a machined part. When the APT program was "compiled", it would result in a punched paper tape that would be fed into a Numerically-Controlled machining center to actually create the part. It was very expensive to use, and though my Dad did let me log in once and look around a little, I didn't want to rack up charges, and stayed away from messing with it. The service was discontinued when MASTERCAM came out for the IBM PC and they bought a couple of high-end PC clones and licenses for MASTERCAM. Anyway, enough old memories. If anyone out there had experience with GE timeshared systems, or may know of existence of any distribution media or source listings of the systems, or perhaps has memories of using them, I'd love to read about it. If you think it might be of general interest to the list, post it to the list, but you are certainly welcome to send it to me directly at moc-dot-enesneb+at+bkcir (backwards with special characters spelled out to hopefully prevent it being snarfed up by 5p@mm3rZ). Thanks for reading, and best to all! Rick Bensene https://oldcalculatormuseum.com Beavercreek, Oregon USA

9 months, 1 week

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Recovering intel intellec microcomputers, hardware and software

by jonesthechip＠logicmagic.co.uk

As the venerable intellec microcomputers have reached their half-century, I'm interested in contacting other owners/collectors to try and obtain original assembler tapes (or their contents) to enable restoration of systems to full working order. My particular interest is in the intellec 4 mod 40 (I've rebuilt the one I used in college, 1975-1977) but I don't have the original software, supplied on paper tape. I've also been in contact with other owners and people interested in making replicas of the intellec 8 and mod 80 systems, and there's a lack of info on the the ROM monitors. Given the historical significance of these fine machines (and my personal annoyance at the lack of foresight I had as a callow postgraduate regarding hanging on to copies of paper tape) I'd like to put a shout out to see if any of this information/software is available in a historical nook or cranny somewhere in the computing world and try to gather it together to help complete systems and share the techniques used when 4K of RAM was a really big, expensive and rather hot deal....

9 months, 1 week

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Looking for a A990 20-slot chassis

by Jesse Dougherty

Does anyone have a 20-slot HP 1000 990 chassis p/n A2959 / A2999 for sale? I can also trade for other 1k / mx HP related hardware. Feel free to email me direct off group to Jesse(a)Cypress-tech.com Thanks Jesse Jesse(a)Cypress-tech.com

9 months, 1 week

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Re: Ward Christensen NY Times Obituary

by Fred Cisin

On Wed, 23 Oct 2024, Mike Katz wrote: > I agree with you but phrased differently. XMODEM is ubiquitous but CBBS created a > totally new way of sharing information and is the forerunner of everything from > CompuServe to the internet, instant messaging and even social media. > > Most people reading an obit would not appreciate the significance of a data transfer > protocol however the first "social media" type message system they would understand. Community Memory (Lee Felsenstein, Ephrem Lipkin, et al) preceded it by about five years. BUT, CBBS was the first with dial-up access [from home], rather than dedicated publicly available terminals. -- Grumpy Ol' Fred cisin(a)xenosoft.com

9 months, 1 week

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Re: RSX11M installation on real PDP11

by Lee Gleason

On 10/19/2024 12:00 PM, cctalk-request(a)classiccmp.org wrote: > [cctalk] Re: RSX11M installation on real PDP11 >You may want to use simh (where you'll be able to mount tapes and RL02 >images) to do the installation and generate an RD32 image. Once you have >the disk image, use vtserver (note - some versions are limited to 32MB >images, but there are some that remove that limitation - check if the >struct vtcmd in vtserver.c uses 2 or 4 bytes for the block number), or >PDP11GUI (Windows only) to transfer the RD32 disk image to your PDP over a >serial port. If you go this route, be advised, that SIMH creates RD32 disk images are not the same size as a real RD32. This will likely cause problems when writing a SIMH created image to a real disk (and I'm not talking about the additional issues that the trailing metadata on disk images from the Pizzolato version of SIMH can cause - the problem I'm describing is caused by an incorrect disk size value in SIMH). -- Lee K. Gleason N5ZMR Control-G Consultants lee.gleason(a)comcast.net

9 months, 2 weeks

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Re: Might be antique computer parts

by donald donaldwhittemore.com

I rue the day I lost an eBay auction. It was a PR photo with a good looking model mounting a disk in an open drawer of a 2314. If you looked carefully you would see she was holding a 2311 disk. The 2314 pack was probably too heavy to use for all the repeated takes the photographer wanted. 😊

9 months, 2 weeks

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RM 380Z software.

by jake utley

I have recently been able to fix my early 380Z blue case however it is a cassette only system and it’s not as simple as adding my spare disk controller so I’m on the lookout for 380 software cassettes or dumps of those cassettes so I can run software on it and demonstrate it at VCF Zurich in January

9 months, 2 weeks

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RSX11M installation on real PDP11

by Peter Ekstrom

Hello to the group, I have acquired some boards and a backplane for a PDP 11/23+. The disk controller is an RQDX3 and I have a 3.5" drive that works as an RX50. I have a greazeweasle so I am able to write RX50 images to 3.5 inch floppies. I also have an RD32 MFM drive that also works. Since I have an M8189 CPU board, I have a second serial port that works as a TU58 device so I can use the tu58em emulator. I also have 512K of memory and a DZV11. Using the TU58 emulator I have been able to get RT-11 up and running on it. My goal though is to try and get RSX11M (I have no FPP right now) on it, but I am somewhat at a loss on how to get it installed. Anyone have any suggestions on how I could do that? I have some .tap files and some RL02 images with various versions of RSX11M, but I don't know how to get them onto my RD32 drive. Thanks in advance for any pointers or suggestions. And let me just say I love finally having a real PDP11!! -Peter

9 months, 2 weeks

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CDC Cyber 180/8xx PSU

by hupfadekroua

Hi all, after approx 30 years of waiting our time has come to get hands on a Cyber 180/860a. These systems as other systems before are using 400Hz psus. One approach would be to use a 50Hz/400Hz power converter. There are ones on the market creating almost pure sinus output with minimal harmonics. Another approach would be to substitute the old psu by modern ones, possibly by DC-DC converters or switching powersupplies. Does someone have experience in the substitution of psus in the multiple KW range or did this in the past? Best Andreas

9 months, 2 weeks

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CDC Documentation and Manuals

by hupfadekroua

Hi all, I do see a lot of CDC documentation on bitsavers like software, hardware concepts, programming concepts, but no logic diagrams, schematics, detailed assembly etc. Didn't publish CDC logic diagrams, schematic, board layouts etc, esp. of course for the 180/8xx series in the past - wasn't such kind of docs ever available? A.

9 months, 2 weeks

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Re: Ward Christensen (BBS, XMODEM) has died

by Fred Cisin

1945 - 2024 Found dead 10/11/24 in a "wellness check". Little or no other information yet. Ward Christensen created the first "BBS". Then, when he needed to transfer files, he created XMODEM. The XMODEM protocols became the de facto standard for transferring files. Later, there was some competition from Kermit, but, other than being "FROM A UNIVERSITY!", it wasn't nearly as good. Not only are all of the greats dying off, but soon there won't be anybody around who even knew about them. -- Grumpy Ol' Fred cisin(a)xenosoft.com

9 months, 2 weeks

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