- test-drb@ccmp.vtda.org - classiccmp.org

50Hz Pulley for 8" Floppy Drive Mitshubishi M2894-63B

by thomas.riesen＠predata.ch

Hi all Any suggestions where to find two 50Hz-Pulleys for the 8" Floppy drive Mitsubishi M2894-63B? If there also the appropriate ribbon gummies available, I would be very happy. Regards Thomas

7 years

4
3
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eBay: CDC 6600 modules

by jnc＠mercury.lcs.mit.edu

So, if anyone wants a CDC 6600 module for their mantle/shelf/etc, here: https://www.ebay.com/itm/283426116822 is someone selling some for a non-ridiculous amount of money (the latter being common with this type of thing). No connection with the seller, other than buying one myself. Noel

7 years

2
1
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Craigslist: RP05 drive cable in Indiana

by silent700＠gmail.com

No affiliation with the seller, just a strange item to come across randomly. Digital BC06S cable, which is mentioned in the manual for the RP05 and possibly others: https://chicago.craigslist.org/nwi/ele/d/multi-pin-digital-cable/6835150645… The ad shows updated two days ago so they likely still have it. J

7 years

2
1
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PDP-8 signed overflow detection

by kylevowen＠gmail.com

What is the shortest subroutine on a PDP-8 which will add two variables in RAM and return the saturated sum (that is, returning 2047 or -2048 upon overflow, otherwise the sum) in the accumulator? Kyle

7 years

5
6
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Epson PX8 disk emulator

by wrcooke＠wrcooke.net

Hello all, I have built an emulator that uses an Arduino and SD card to provide four "floppy drives" for an Epson PX8.? It may also be usable with a PX4, but I have no way of trying it. If you would like to build one yourself, or just read about it, the details are here:?http://wrcooke.net/projects/pfbdk/pfbdk.html Any feedback is appreciated (I already know the page is crummy.)? Especially if you build it I would like to know good or bad experience. Thanks, Will "He may look dumb but that's just a disguise."? -- Charlie Daniels "The names of global variables should start with? ? // "? --?https://isocpp.org

7 years

13
22
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Matching paint on DEC monitors, cases and cabinets

by abacos_98＠yahoo.com

Has anyone ever found a source for aerosol spray cans that are a close matchto the colors that DEC used on their cases and such? I remember seeing touch up colors mentioned in the past. Specifically the ivory/almond colorof VT100's, DECservers, etc. Brian

7 years

8
8
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atex system in Houston

by fritzm＠fritzm.org

Hmmm, are these the atex racks seen lurking in the background of that recent storage space trawl down near Houston? https://www.ebay.com/itm/Vintage-DEC-PDP-11-34-Minicomputer-With-Kennedy-Ta…

7 years

13
29
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middle-aged APL terminal

by turing＠shaw.ca

Hi All: This is my periodic request for technical details on a Cybernex APL-100 terminal - the only documentation that I have for it is the sales brochure...

7 years

1
0
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Opening old DEC files

by curt＠atarimuseum.com

I have many DEC files that I?ve recovered from old VMS backups to a PC. Many are Word-11, ALL-IN-1 WPS and VMS Mail MAI files. They don?t open well in programs like the Windows Text editors Is there a program on Windows that can open these files and recognize all of the formatting and control commands so they can be properly viewed?

7 years

7
8
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Opening old DEC files

by jfoust＠threedee.com

At 02:54 PM 3/22/2019, Zane Healy via cctalk wrote: >Years ago, there was a program for the Mac that would convert a TON of different file formats. Trying to figure out what that was, MacLinkPlus. https://en.wikipedia.org/wiki/MacLinkPlus_Deluxe http://www.sonic.net/mnitepub/pccafe/reviews/dataviz_maclinkplus/dataviz_ma… - John

7 years

1
0
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Rk611 controller

by abacos_98＠yahoo.com

I just acquired an RK07 drive and disk packs. I am looking for the 5 Unibus boards and back plane to add to my 11/84.? Brian. Sent from Yahoo Mail on Android

7 years

3
2
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ISO: Sanders Associates 720 hardware docs / parts

by derschjo＠gmail.com

Hi all -- I picked up a Sanders 720 terminal -- well, the display/keyboard portion anyway -- and I'm looking for actual hardware documentation so I can maybe someday replicate the 701 control unit (or heck, maybe someone has a 701 sitting around somewhere...). Anyone out there have docs (apart from the brochures already on bitsavers) or any parts lying around? Thanks as always! Josh

7 years

1
0
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HP 1000 Series board available.

by jesse＠cypress-tech.com

I have a bunch of these boards for the 1000 A class servers... I have plenty of each of the following. If anyone wants or needs and of the following, let me know. 12040x? Asynchronous Multiplexer - $50.00 each 12009A? HP-IB Interface - $75.00 each 12103D? 1MB Memory board - $65.00 each 12103C? 512kb Memory board - $65.00 each 12220A? 768kb Memory board - $65.00 each Thanks Jesse Cypress Technology Inc

7 years

1
0
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Link MK1 and GP4

by aek＠bitsavers.org

Josh scanned some Link Mark I documentation, and I found a pdf describing some of the history of early Link digital flight simulators uploaded to: http://bitsavers.org/pdf/generalPrecision/Link_Mark_I

7 years

4
3
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SCSI2SD: Is it worth a try?

by chd＠chdickman.com

What is the experience with the SCSI2SD with old computers? It looks to be SCSI-1 and SCSI-2 compatible and I see a lot of reports of usage on this list. I am curious about how well it works and which version to get. Versions up to 5 seem to be GPLed and reasonably available. V6 does not seem to have schematics or boards open sourced and I haven't seen a supplier for them. The web page lists some sources, but they don't have the V6 available. It looks like the V6 is not open because someone used the design without following the GPL. V6 claims synchronous transfers, but I don't think most of my hardware supports it. That consists of VAXstations and qbus scsi cards. If I was after speed I wouldn't be using old hardware, but the speed has to be consistent with the era. Chuck

7 years

16
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VCF PNW 2019 is this weekend

by mbbrutman＠brutman.com

One last short reminder ... VCF PNW 2019 is this weekend! We have 30 exhibits, 6 presentations, and the consignment area. Admission is free with paid admission to the museum, so come check out both the event and the museum! Details can be found at http://vcfed.org/vcf-pnw . -Mike

7 years

1
0
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POP-2 silver book

by dstalk＠execulink.com

Is there anyone out there who could scan page 261 of "Programming in POP-2" by Burstall, Collins, and Popplestone for me? Also, does anyone have a copy of POP-10? Thanks, Don

7 years

3
2
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DECimage questions

by jzatar2＠illinois.edu

On Tue Mar 19 01:49:08 CDT 2019 >On 2019-03-17 20:36, Chris Hanson via cctalk wrote: >>/I recently acquired a DECimage X terminal, which is theoretically a VXT-2000 with an add-on 2D accelerator. Unfortunately while the terminal is badges as a DECimage it didn?t include the board, just a frame buffer. / >>// >>/Does anyone have a spare DECimage board they?d be interested in parting with, or know a reasonable place to obtain one? / >>You have the board number? >>Sometimes if we discuss something here, magically boards show up on ebay. >>Just an observation ;-) Does MA-0270-92A help? got that number out of the VXT 2000 Installing and Getting Started Guide (EK-VXT20-IN), but it might be a two-part kit (accelerator board + DECimage sticker). The VXT 2000 Windowing Terminal and DECimage 2000 Option Service Guide (EK-VXT20-SV) lists VX20A-OP for the DECimage 2000 module. For the twisted pair ethernet module, the same manual lists 54-20482-01.

7 years

1
0
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HELP needed on a vocabulary problem ;-)

by gerardcjat＠free.fr

The TECHNICAL problem : I am repairing a not so old electric typewriter. I need to replace what I call : a flexible printed circuit ( strip / ribbon / what's the "correct" word ??? ) *** AND *** the associated connector I searched Mouse, Digikey, Arrow, etc ... catalogues and find absolutly nothing !! I think I DO NOT use the correct WORD(s) for my search. What are the "usual" words for the TWO items I describe ?? Many thanks for your help, Guys

7 years

4
3
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POP-2 silver book

by dstalk＠execulink.com

Thanks, page 261 has been found! Now for POP-2 or POP-10. Don

7 years

1
0
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DECimage questions

by cmhanson＠eschatologist.net

I recently acquired a DECimage X terminal, which is theoretically a VXT-2000 with an add-on 2D accelerator. Unfortunately while the terminal is badges as a DECimage it didn?t include the board, just a frame buffer. Does anyone have a spare DECimage board they?d be interested in parting with, or know a reasonable place to obtain one? How about other components for this machine? I have the AUI/thin Ethernet card and wouldn?t mind replacing it with the AUI/twisted-pair card, and I?d also like to max out the RAM: It has 2MB onboard and I have the riser card with SIMM slots and one SIMM for an additional 4MB. It uses what I?m told are DEC MS200-AA (2MB) and DEC MS200-BA (4MB) modules, which look like regular 72pin SIMMs. Are they special or are they compatible with anything common? ? Chris Sent from my iPad

7 years

3
2
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Any intel UPP-103 personality boards for sale?

by andrewsofbg＠gmail.com

I am in the market for a UPP-816 and a UPP-878 personality boards if anyone is thinking of selling theirs. Please message me. Thanks Craig

7 years

1
0
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DECimage questions

by jzatar2＠illinois.edu

>I recently acquired a DECimage X terminal, which is theoretically a VXT-2000 >with an add-on 2D accelerator. Unfortunately while the terminal is badges as a >DECimage it didn?t include the board, just a frame buffer. That's unfortunate. My VXT2000 doesn't have that board either, I've always wondered how much it helps. I'm not too sure if the bottleneck is usually the 10mbit networking or the graphics. Probably depends a bit on whether you're using modern X11 applications or not. Modern stuff all likes to assume true-color (24bit or thereabouts) and render stuff locally and send it again to redraw, rather than rendering on the (remote) xterm it seems... >Does anyone have a spare DECimage board they?d be interested in parting with, >or know a reasonable place to obtain one? Unfortunately, as I already stated I don't, and my only idea where to get one is ebay and similar sites, which I'm sure you already know. >How about other components for this machine? I have the AUI/thin Ethernet card >and wouldn?t mind replacing it with the AUI/twisted-pair card, and I?d also >like to max out the RAM: It has 2MB onboard and I have the riser card with >SIMM slots and one SIMM for an additional 4MB. No clue where to get a twisted pair module, but mine has one. I currently have it hooked up to our thinnet segment though, and I've had it on our thicknet segment previously (now we have a proper VAXen occupying that transceiver). >It uses what I?m told are DEC MS200-AA (2MB) and DEC MS200-BA (4MB) modules, >which look like regular 72pin SIMMs. Are they special or are they compatible >with anything common? > >? ? Chris > >Sent from my iPad Here's where I can help you. The SIMMs aren't really anything special, you can use 2MB and 4MB modules. The VAX SOC in the VXT is slow enough that you probably don't have to worry about access time, so 60 or 70ns modules are probably both fine. If you don't have a 4MB module laying around, you can use an 8MB or 16MB module, but you have to install a wire from a ground pin to A10 on the SIMM connector and fix the presence detect bits, IIRC. (A0-A9 gives 1024 rows and columns, 1M-word per bank, 4 bytes per word, so 4MB SIMM. DEC left the unused address lines floating, and that causes issues with bigger SIMMs). You can also install a single jumper IIRC to make 16MB SIMMs appear as 4MB, and 8MB SIMMs appear as 2MB (it's just grounding one of the PD lines, I don't remember which). The most you can fit into a VXT2000 is 18MB IIRC, that's 3 4MB SIMM, + 4MB on the riser itself + 2MB on the motherboard. Lastly, you'll need the VXT2000 SW, which I extracted from some VMS (infoserver?) CDs several years ago. Someone put them up on terminals-wiki.org, so you can grab them there: http://terminals-wiki.org/collections/DEC/vxt2000.zip VXT021KT10.SYS is the full blown VXT software including local side applications, like DECWindows etc. VXTLDR021.SYS is some intermediate loader you can use to get an NFS swap file or something like that if you have an infoserver or VMS running the infoserver software IIRC. VXTEX020A.SYS is *just* the X server IIRC, missing the local side applications but having a smaller memory footprint. This doesn't even have a window manager, so you'd have to use it with a remote one and set up XDMCP. The terminals boot from MOP or TFTP/BOOTP with late enough firmware. MOP has a daemon available for linux and BSDs, if you'd like to go that route, but otherwise TFTP/BOOTP is probably better supported by modern infrastructure Hopefully this was helpful. If you have any further questions, don't hesitate to ask. I'm probably one of a few people who bothers to keep a VXT around running, so I can probably answer most questions you might have about setup and operation. Best Regards, Joe Zatarski

7 years

3
2
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Clearpoint SNXRAM/12 VME

by earl＠baugh.org

Hey, Anybody happen to have any documentation for a Clearpoint SNXRAM card? I?ll take any version ( though I have the /12 card ). I?m trying to figure out the jumpers on this board. It generates a memory error in my Sun 3/110 but not sure if that?s because of overlapping addressing. I?ve tried searching for the doc for years ( this year I?m trying very hard to get my Sun 2/120 and Sun 3/110 running correctly. Got my Sun 1/100 and Sun 4/110 booting correctly, disk images are almost ready for them ) Earl Sent from my iPhone

7 years

1
0
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Fwd: Sun 3/XXX 240v power supply — switch to 115v — is it possible?

by earl＠baugh.org

Howdy, I?ve recently gotten a second Sun 3/Xxx 3 slot VME chassis, however the power supply is a EU version, 240v. I know on a number of ?newer? power supplies there is a switch to go from 240 to 115. I?ve taken this one apart ( at least to the point where it comes off the bottom of the VME chassis ? but left the thick cables still connected. ) I haven?t found any switch or any indication that it can switch. Googling and looking at the FEH hasn?t yielded any info either. Anybody know if it?s possible to switch this type of PS? Thanks Earl Sent from my iPhone

7 years

2
1
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Fwd: Sun 3 with SCSI2SD

by earl＠baugh.org

Howdy, Wondering if anyone has used a SCSI2SD card with a Sun 3 class machine. I know Walter B has had success with the Sun 2( that?s next on my list after I get the Sun 3/110 working with one. ) I have some Version 5 of the card. (I also have a version 3 card that I tried long ago, with little success). The new current firmware is much more understandable in terms of setting it up. However with a known good image ( obtained from Walter B) I can?t get it to go past the message ?Waiting for disk to spin up...? followed by ?Please start it, if necessary , ? OR ? press a key to quit.? I know the card doesn?t need to spin up ? so question is, what is the boot prom waiting for? I expect it?s just something off in my config but so far everything I?ve tried yields the same result. Anybody have a config.xml that works that they could share? ( and which firmware version it works with? ) Thanks Earl Sent from my iPhone

7 years

1
0
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Sun 3/50

by fedorkow＠mit.edu

I have a Sun 3/50 diskless workstation in the Boston area, which I'd like to see go to a good home.? I no longer have the monochrome monitor that went with it, but I do have the original keyboard and mouse.? It hasn't been powered up in some time, but worked without problems until I took it out of service. ? Contact me at guy.fedorkow at gmail.com if you're interested? Thanks /guy

7 years

1
1
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searching for TEAC MT-2R tape deck documentation

by henk.gooijen＠hotmail.com

Hi guys, Today I found a TEAC MT-2R cassette tape drive on a radio amateur flee market. These tape drives use a tape cassette similar to the audio tape cassette. The MT-2R tape deck has servo control logic for tape motion and a CPU with firmware taat makes the tape unit a block-addressable device (AFAIK). However, I can only find doc of the MT-2ST, but that is another MTU. Does anybody have doc of the TEAC MT-2R ? Thanks, Henk, PA8PDP

7 years, 1 month

1
0
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SCSI2SD on VMS 5.4

by robert.jarratt＠ntlworld.com

I have been experimenting with a SCSI21SD V6 card trying to get it to work on a VAX 4000-200 running VMS 5.4 using a KZQSA. It seems to recognise that there is a SCSI device there, but any attempt to access the device from VMS 5.4 results in a Fatal Drive Error. I tried booting a VMS 7.3 image from the SCSI2SD card and that worked. Obviously I have played with some of the settings, like SCSI2 mode etc, but I have not found anything that works. Has anyone succeeded in getting this board to work on VMS 5.4? Thanks Rob

7 years, 1 month

3
3
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ISO: Docs for Andromeda VDC-11

by derschjo＠gmail.com

Hi all -- Anyone happen to have any documentation for the Andromeda VDC-11? This is a dual-height qbus board that provides 512x256 graphics and can act as the PDP-11's console device (it emulates various different terminals, depending on the model of the VDC-11). I'm interested in programming information as well as jumpers and connector pinouts. Thanks! Josh

7 years, 1 month

1
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Latest batch of items from Sellam's Collection

by sellam.ismail＠gmail.com

Greetings! The Ides of March brings another list of stuff from Sellam's warehouse: Toshiba T3200SX documentation and software Microsoft Serial - PS/2 Compatible Mouse ADDS ViewPoint dumb terminal SGI CD-ROM Library Oki Data Microline 184 Turbo Dot Matrix Printer Xerox WP7700 Word Processor Reference Manual TRS-80 Disk & Other Mysteries PMMI Communications MM-103-9 Communications Adaptor General DataComm Industries GDC 1001A Data Coupler (RBS-3) Commodore Model 6400 Word Processor Printer User's Manual MITS DV1600 Digital Volt Meter Assembly Manual MicroMint SB-180 Rev 2.0 Monitor ROM Coactive Connector for DOS/Windows Macintosh SE/30 system MacTerminal MacDraw Teletype Corporation Model 33 Teletypewriter documentation set AMPRO Little Board/PC Technical Manual AMPRO Little Board/PC Model 4B documentation AMPRO Little Board/PLUS documentation Radio Shack TRS-80 8" Single/Double-Sided Diskettes (Box of 10) Citizen iDP-560-RSL Dot Matrix Printer VAX DEC/Test Manager DEC LA324 Multiprinter Installation and Operator's Guide VMS DECwindows Desktop Applications Guide VMS User's Manual HP Infiniium Oscilloscope Model HP 54835A/45A Service Guide IBM PC Network documentation Utilities Unlimited, Inc. EMPLANT Emulator Board North Star Computers external 5.25" floppy drive enclosure kit Opus SS/SD 5.25" floppy diskette 10-pack GoldStar GS520 Laptop Xerox 2-button Mouse Find the links to these and other fine vintage computing items here: https://docs.google.com/spreadsheets/d/1I53wxarLHlNmlPVf_HJ5oMKuab4zrApI_hi… Please do contact me directly by e-mail via <sellam.ismail at gmail.com> to make an order or an offer. Thanks! Sellam

7 years, 1 month

1
0
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Old terminal photos with Frotz running

by dave＠661.org

I was wondering if I could get some photos of assorted old terminals displaying Frotz running Infocom games. I'm particularly interested in seeing the VT52, VT100, LA36 / LA120, ASR33, and TVI-910 like this. -- David Griffith dave at 661.org

7 years, 1 month

1
0
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PDP 11/60 Print Sets

by g-wright＠att.net

Message: 10 Date: Tue, 12 Mar 2019 15:56:51 -0500 From: David Williams <nospam212-cctalk at yahoo.com> To: CCTech <cctech at classiccmp.org> Subject: PDP 11/60 Print Sets Message-ID: <da0952f4e4e517d579246b0194465201 at yahoo.com> Content-Type: text/plain; charset=US-ASCII; format=flowed Many years ago I gave away some PDP 11/60 hardware to someone on this list but don't recall who it was (Ethan maybe?). Anyway, I have recently discovered a stack of various print sets that I believe went with that system and would like to send them along. If you recall that long past transaction (10 years ago maybe? More? Less? Don't recall exactly, old age is killing my memory) please contact me so I can make arrangements for these. And if you aren't interested please let me know so I can see if anyone else is interested in them. Thanks. David Williams www.trailingedge.com David, If you need a home for these,? I have 2 complete 11/60's and would dearly like to have them. Thanks, Jerry

7 years, 1 month

1
0
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Looking for 12016-60002 HP Single Ended Cable

by jesse＠cypress-tech.com

12016-60002 - SE Cable - card edge connector to 50-pin low density bail lock (M) - 2m (6.6ft) long If anyone has any of these, let me know, I can use about 4 of them. Thanks Jesse Cypress Technology Inc

7 years, 1 month

2
1
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Pioneers of computing

by c.murray.mccullough＠gmail.com

Thanks for the info on chip made by Texas Instruments. It was used in a pocket/plug-in calculator I had while working as a payroll clerk back in the early 70s. The link is: http://www.vintagecalculators.com/html/ti_cal-tech1.html I?ve written in my book on the History of the Microcomputer a history of the processing chip as the timeline follows an approximation of: Late *1950*s ? patent on integrated circuit by Texas Instruments *1950*s to *1960*s ? move from vacuum tubes to TTL technology programs/functions in ROM *1970*s ? 4004 to 8008 to 8086 -> This begins the era of electronic computerization of society. -> programmable by user and/or firmware We are now in the early human era of the electronification-computerization of society. *Classic Computing* takes us back to the very early years. Happy computing!

7 years, 1 month

5
6
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Pioneers of computing

by c.murray.mccullough＠gmail.com

Back in 1965 Jack Kilby, Jerry Merryman and James Van Tassel at texas Instruments created an integrated circuit designed to replace the calulator. Historians, though not all, credit this development as the beginning of the electronic-computing revolution that was truly underway by the mid-70s. Vintage/classic computing our hobby goes back that far as us baby-boomers can attest to. Happy computing all!

7 years, 1 month

11
15
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PDP 11/60 Print Sets

by nospam212-cctalk＠yahoo.com

Many years ago I gave away some PDP 11/60 hardware to someone on this list but don't recall who it was (Ethan maybe?). Anyway, I have recently discovered a stack of various print sets that I believe went with that system and would like to send them along. If you recall that long past transaction (10 years ago maybe? More? Less? Don't recall exactly, old age is killing my memory) please contact me so I can make arrangements for these. And if you aren't interested please let me know so I can see if anyone else is interested in them. Thanks. David Williams www.trailingedge.com

7 years, 1 month

2
1
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DECnet License for older VAX VMS

by abacos_98＠yahoo.com

Hello,I have a current hobbyists license for OpenVMS 7.3 and a handful of simulated VAXen. I wanted to add my simulated 11/780 and 11/782 to my DECnet and wondered if there was a (legal of course) license workaround to install networking on an older version such as 4.4. The current PAKS will not work.Brian. Sent from Yahoo Mail on Android

7 years, 1 month

6
8
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VAX 4000-100 Free to a good home

by ken.s.moser＠icloud.com

I have one, with some disks and other misc gear. Headed for the dump if I cannot find a home. Would prefer to find a home for my old friend... Ken Moser 703.587.3868

7 years, 1 month

7
7
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VAX 4000-100 Free to a good home

by jnc＠mercury.lcs.mit.edu

> From: Zane Healy > Based on his area code, he's in Virginia, near Washington DC. So far > enough that I can't be tempted That's a small enough machine that it wouldn't cost much to ship (via Pak-Mail or similar, if the current owner's not up for dealing with shipping). I'm not too far from DC, but it's still 6 hours on the road for a round-trip, so not too resource-effective for me to go get it. Noel

7 years, 1 month

1
0
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DEC RC25 / CDC 9457 lark disc

by shadoooo＠gmail.com

Hello, I always have been amazed by the complexity and peculiarity of fixed/removable hybrid discs like DEC RC25 and CDC 9457. Looking at some specifications found on the web, these drives look quite similar each other, even if these are completely different on an exterior / interface point of view... Maybe there's some compatibility between the two products? Thanks Andrea

7 years, 1 month

2
1
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Old Macs available

by nospam212-cctalk＠yahoo.com

I am clearing out a storage space and will be offering up some of the old systems and miscellaneous peripherals currently stored there as I clear and sort things.? To start with I have the following available. If anyone is interested or knows where else to offer the various items contact me off list.? If I can't find anyone interested I'll probably just send things on to recycle as I need to clear and close the space. All of the following are base units, no keyboards or other external peripherals although I suspect there may be keyboards somewhere in the storage space but can't guarantee it. If I do find some I can pass them along with the units if interested. 1) Macintosh SE/30 - Appears to have some expansion card of some sort inside with with a 15 pin connector and what I think was a BNC connector? 2) Macintosh SE/30 - Has a ribbon cable coming out the expansion slot in the back but no idea what it connects to inside or anything else about it.3) Macintosh Plus 1Mb - This sounds like there might be something loose inside if you turn it over. All systems are in unknown state and unopened so I have no idea what is inside or what condition they may be in. Systems are located in Houston, TX. Contact me off list if you need any more info or interest in these systems. Thanks. David Williamswww.trailingedge.com

7 years, 1 month

4
5
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Rainbow 100 PSU capacitor list

by aperry＠snowmoose.com

Hi, I think that I need to re-cap the power supply in a Rainbow 100. Does anyone here know if anyone has put together a list of capacitors used in the power supply that I can use to order parts? alan

7 years, 1 month

6
19
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Tape reading question

by pat＠vax11.net

Since I'm going to be out in Seattle for a week to participate in VCF/PNW, I was wondering if anyone in the area could lend me a hand with help reading in an old QIC-24 25MB tape cartridge or two? One has the TurboDOS backup/install media for a Televideo TS-816 that I got >from Don Maslin back in the day. I think the other one is related too, but it was unmarked. I would like to at least try to get images off of them. At least one of them has a working belt.. the other ones fell apart when i tried removing the belt to reform it. Thank, Patrick Finnegan

7 years, 1 month

6
15
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Parts source

by wrcooke＠wrcooke.net

This may or may not be new or useful to anyone here, but I came across this website by accident today. They have a considerable selection of rather hard to find parts for old home computers, game consoles, and even arcade machines. Figured I would send along the link. http://www.arcadecomponents.com/index.html "He may look dumb but that's just a disguise."? -- Charlie Daniels "The names of global variables should start with? ? // "? --?https://isocpp.org

7 years, 1 month

2
1
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Thinking about PDP11 PC05 Emulation

by cube1＠charter.net

I have several PDP-11's in my collection (among other things), and not enough PC05 tape readers (or enough room) to go around. But most if not all of my machines have M7810 PC11 interfaces, and I have one I could move from machine to machine as needed. Moving a PC05 around would be a lot more work, and not every rack has room. ;) So, I took a look at what it might take to interface with an M7810 (or, down the road, a PDP-8/L or PDP-12. It looks like the emulator would have to accept as input just 3 lines (Initialize L, IOP2(1)/Select, IOP4(1)/Read) [It would not need the redundant Initialize H, IOP1(1), Qualify or Skip], and would have to drive 11 lines into the pullups on the M7810 (8 Data lines, IO Bus INT L/Reader Done L, Outtape/Error and RDR RUN L/RDR Busy L). So, a total of 14 interface lines. (The 8 or 12 would take a few more lines). The pullups average about 470 ohms (1 is 1K, 1 is 220, the rest are 470), so at 5V the output has to sink a bit over 10ma, and all total 120ma. An Arduino Uno with an Ethernet shield would have 20 minus 5 lines available, in theory, but if one wants serial I/O as well for debugging, that sucks up 2 more lines - so only 13 available. And sinking 120ma would be a bit much though I could likely sprinkle inputs among the outputs to make it work so as to stay within the recommended sink limits, and at least initially have it never run out of tape, and tie Error down. http://playground.arduino.cc/Main/ArduinoPinCurrentLimitations So, I am thinking about an Arduino Mega, as it has more output groupings to sprinkle the sink current around, and 5V interface capability, and more pins to eventually support my PDP-8/L and PDP-12. (I could do it with a PIC - did that for a Documation card reader to PC interface, but I am really tired of fighting Microchip's IDE.) BUT - it also occurs to me someone may have already done something like this? Any leads / ideas? JRJ

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Pioneers of computing

by r_a_feldman＠hotmail.com

>Date: Sun, 10 Mar 2019 17:18:26 -0400 >From: Murray McCullough <c.murray.mccullough at gmail.com> >Back in 1965 Jack Kilby, Jerry Merryman and James Van Tassel at texas >Instruments Merryman died on February 27. >From the New York Times (March 7, 2019): Jerry Merryman, Co-Inventor of the Pocket Calculator, Dies at 86 https://www.nytimes.com/2019/03/07/obituaries/jerry-merryman-dead.html Bob

7 years, 1 month

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Pioneers of computing

by jnc＠mercury.lcs.mit.edu

> From: Brent Hilpert >>> Back in 1965 Jack Kilby, Jerry Merryman and James Van Tassel at texas >>> Instruments created an integrated circuit designed to replace the >>> calulator. Historians, though not all, credit this development as the >>> beginning of the electronic-computing revolution that was truly underway >>> by the mid-70s. >> Scotty, more power to the Reality Distortion Field! > It's not an out-to-lunch suggestion. > The digital pocket calculator was the first mass-market digital electronic > device to be put in the hands of the consumer. It's not clear which element of the original post that Al was referring to; I saw several things I might disagree with: - Unless you look at the date carefully, the notion that TI's work developing chips was intended to replace the calculator. - The notion that it was calculators that drove the development of micros; Intel had actually started work on a micro for Datapoint, which was eventually released as the 8008, _before_ they started on the 4004 for Busicom. I'd have to think long and hard before I rendered a judgement on how important digital pocket calculators were to where we are today. My initial reaction is to say 'not very', though - early personal computers, centered on Silicon Valley, were mostly driven by having, well, a personal computer. It's not clear that widespread ownership of personal calculators did anything to drive that. Noel

7 years, 1 month

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Trio laboratories inc PSU schematic?

by mattislind＠gmail.com

Does anyone have schematic for a Trio Labs PSU made in 1975 https://i.imgur.com/MTwcpRA.jpg It is a primary side switcher made in 1975 outputting 100 Amps 5Volt. Quite early for being primary switcher I would guess.

7 years, 1 month

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Unix tools, Bill Webb, UBC, TRIUMF

by boris＠summitclinic.com

I used to work at UBC in Pharmacology in the 1980's and had a few talks with Bill Webb about Unix but, unfortunately, for the data acquisition we were doing Unix was far too slow and I did everything in optimized PDP-11 assembler. Of course, we didn't have a PDP-11/45 like Bill had and had to make do with a slower PDP-11/34. Bill had hacked Unix considerably and it was locally known as Webbix on campus. Played around with Unix and Webbix back then but don't think I have the tapes anymore. One of the RL01 or RLO2 disks I picked up at SERF in the 1990's (along with a MINC system) contained a copy of Webbix but I'm not sure I copied it. Gave away the MINC and 2 RLO1 or RLO2 drives to a guy in Seattle about 2006 and hopefully he's copied them. Boris Gimbarzevsky >I recovered several pieces of Unix media ? all >of whichh I think made it into TUHS/PUPS >collection - at UBC in the mid-1990???s while I was working at TRIUMF. > >Those Unix disks and tapes came from a SERF sale >(Surplus Equipment Recycling Facility) on UBC >main campus, not from TRIUMF. Bill Webb was a >common thread for Unix use in the biology department at UBC. > >TRIUMF extensively used Data General Nova, then >Eclipse (both 16 and 32 bit), computers from >opening through the 1990???s for both cyclotron >control systems and data acquisition for >experiments. They also had a fair number of >PDP-11???s and VAXen running RSX-11, RT-11, and >VMS. I myself had an Alpha workstation on my >desk for the two users I was at TRIUMF. > >One of my favorite connections between TRIUMF >and UBC, was the underground pneumatic tube used >to rapidly carry short lived isotopes produced >in the cyclotron to the main campus for biology >and medical uses. It should not come as a >surprise to anyone that I still work in moving >things and people through underground tunnels ???? > >Tim N3QE

7 years, 1 month

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