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

by captainkirk359＠gmail.com

Does any one know if there's a copy of the PDP-11/70 Processor Handbook somewhere out there on the intertubes? Manx says no, similarly looking on BitSavers finds nothing. Cheers, Christian -- Christian M. Gauger-Cosgrove STCKON08DS0 Contact information available upon request.

11 years, 11 months

10
14
0 0

SGI CD Part Numbers

by legalize＠xmission.com

I've been maintaining a page on nekochan's wiki containing all known CD part numbers and whether or not I have an archive of the CD. If you have SGI CDs laying around that aren't on this list, or aren't archived, please email me. <http://www.nekochan.net/wiki/User:Legalize/CD_Part_Numbers> -- "The Direct3D Graphics Pipeline" free book <http://tinyurl.com/d3d-pipeline> The Computer Graphics Museum <http://ComputerGraphicsMuseum.org> The Terminals Wiki <http://terminals.classiccmp.org> Legalize Adulthood! (my blog) <http://LegalizeAdulthood.wordpress.com>

11 years, 11 months

1
1
0 0

wanted: Mostek Z80 Micro-Reference Manual, Zilog Z80 DMA Technical Manual

by spacewar＠gmail.com

Does anyone have an extra copy of the Mostek Z80 Microcomputer System Micro-Reference Manual (a small 30ish page reference booklet, Mostek publication number MK78516) that they'd be willing to part with? I'd like to have an original, but a good scan would be the next best thing. There doesn't appear to be a decent scan of it online. There's a common scan of it that missing pages, poor registration, etc. Also looking for the Zilog Z80 DMA Technical Manual (not the data sheet). The more recent (late 80s through present) Zilog documentation is absolutely riddled with errors. It looks like it went through several generations of conversions between typesetting systems, getting worse at each step. I'm willing to pay modest prices and postage for those, and for other 70s and early 80s Z80 family documentation from either Mostek or Zilog, in order to produce good quality scans.

11 years, 11 months

4
7
0 0

VCFMW Roomates

by slandon110＠gmail.com

Sabrina and I were only able to get 2 queen bed room for VCF/ECCC. So if anyone wants to share let us know. We got the room

11 years, 11 months

1
0
0 0

Non-interrupt use of uPD765/8272

by spacewar＠gmail.com

I still haven't figured out how to get interrupts from the uPD765 FDC in the Quay. I think they're probably routed via a Z80-PIO input, but no luck so far. While the DMA support in the uPD765 is by design optional, they clearly *really* intended that interrupts be used. The Quay boot ROM just uses a very long fixed delay after the recal before doing a read. That's obviously not great if you want good performance. I tried several unsuccessful approaches to waiting for a recal or seek to complete before finally noticing that the FDC will reject the "sense interrupt status" command as illegal if there isn't a pending interrupt. Now my code issues that command repeatedly until it does not report an illegal command. Has anyone found an easier way to use the uPD765 without interrupts?

11 years, 11 months

3
7
0 0

6809 vs. 6809E

by mike＠fenz.net

I'd noticed that one, it looked promising. No mention of support for the E signals, but it seems likely that they'd available somehow. Given your signature, it's interesting that the main target is my Bally 'Doctor Who' pinball machine! On 3/07/2014 7:28 a.m., The Doctor wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA512 > > On 07/01/2014 09:34 PM, Mike van Bokhoven wrote: > >> Now there's a suggestion that has my attention. I have thought >> about this before, but I have no FPGA experience at all, and >> wouldn't know how to start. If it's just a matter of taking a a >> core model, > > For what it's worth, there's one out there right now: > > http://opencores.org/project,6809_6309_compatible_core > > I don't know if it's sufficiently developed to be of use to you (I > haven't tried to synthesize it), but it's a place to start. > > - -- > The Doctor [412/724/301/703] [ZS] > > PGP: 0x807B17C1 / 7960 1CDC 85C9 0B63 8D9F DD89 3BD8 FF2B 807B 17C1 > WWW: https://drwho.virtadpt.net/ > > "Why couldn't you put the bunny back in the box?"

11 years, 11 months

5
4
0 0

Motorola/AMI 6834 EPROM datashseet

by spacewar＠gmail.com

Does anyone have a datasheet for the Motorola or AMI 6834 EPROM? Thanks! Eric

11 years, 11 months

2
2
0 0

Looking for: Intertec Superbrain power supply schematic

by derschjo＠gmail.com

Anyone happen to have the schematic for the original SuperBrain's power supply / I/O board? I thought I'd found it on Bitsavers (see here: http://bitsavers.trailing-edge.com/pdf/intertec/schematic.pdf, pages 11 and 12) but now that I've sat down to do some debugging the two don't appear to match (the schematic is dated 1981, so it's likely describing a later revision than the one in my machine...) Mine's labeled: Intertec Data Systems (c) 1979 Power I/O Board 1424002-04 Rev. 04 Currently the +12V rail is only reading a couple of volts under load and a schematic'd help trace down the fault. (I will get better at debugging power supplies, I will...) Thanks, - Josh

11 years, 11 months

1
0
0 0

Sun-1 Update

by silent700＠gmail.com

I am still gathering info on the Sun-1 (or -2 in a -1 box) I posted about recently. I expect I'll be doing so for some time but I have gathered some interesting clues as well as historical bits that I will assemble at some point. For now, I have a board inventory and photographs for the Multibus voyeurs out there: http://silent700.blogspot.com/2014/07/sun-1-board-inventory.html - jht

11 years, 11 months

1
0
0 0

Noob analog question (no doubt simple)

by brain＠jbrain.com

Trying to help out some folks on the cbm hackers list read the 6500/1 ROM in the 1520 plotter. It turns out, based on the data sheet, there is a way to put the CPU in a "test" mode and send opcode data to the CPU, and we are going to try to to use that to read the contents of the ROM. The test mode is engaged by placing 10V on the RESET pin. And, you know, before tonight, I thought I was at least average on transistor theory and application, but I'm stumped, and I'm hoping someone can help. To support 3 voltages on RESET (0,5,10), I placed a 2n3904 with the collector on the RESET pin, and emitter on ground. base is biased via 10K resistor to an IO pin on an AVR uC I am using the drive the CPU. That works fine. TO support putting 10V on the RESET, I built a PNP/NPN pair. PNP has E on 10V, C on RESET, and B is biased via 10K to C on NPN. B on NPN is biased via 100K to another IO pin, and E is at GND. The thought was that driving the IO pin high, the NPN will pull the PNP base to ground, thus turning on the PNP, and placing 10V on RESET. And, it works, but it "fades". Over 2ms, RESET slow falls from 10V to ~6V. If I turn the transistor off and then back on, the cycle repeats. So, I obviously am doing it wrong, but I can't seem to determine where my theory fails me, and I thought someone on here could help (or suggest another simple way to support 3 voltages on the RESET pin under SW control. Jim -- Jim Brain brain at jbrain.com www.jbrain.com

11 years, 11 months

5
8
0 0

DEC 8881 OC Bus Driver Chips

by rick＠rickmurphy.net

At 01:28 PM 7/6/2014, Mattis Lind wrote: >When repairing a TU60 drive that had faulty DEC8881 I replaced them with >DM7439. They were $2.76 each when buying 25 pieces. The original faulty >chips were marked 7439 on the backside. By way of confirmation, I have a bunch of (I think Signetics) 8881 chips marked 7439 on the bottom as well. -Rick

11 years, 11 months

6
6
0 0

KA630 emulator: another milestone!

by mouse＠Rodents-Montreal.ORG

Back on June 9th, I wrote that my KA630 emulator was to the point of passing POST. I've been working on the DEQNA emulation, and it's now to the point where it MOP-loads and runs the NetBSD bootloader. Now I need to juggle things around to get it running on the same cable as my house netboot server; once that's done I'll see how much of NetBSD it runs! [DP-Frank] 35> run -deqna 0tap/dev/tap0 -ram 15 XQA0: MAC 02:00:58:51:41:30, connected to tap0 (0 041f0000) 20040000: 11 4e brb 20040050 vax> g [c [c [c [c \[4i KA630-A.V1.3 Performing normal system tests. 7..6..5..4..3.. Tests completed. >>> b xqa0 2..1..0.. >> NetBSD/vax boot [Jul 3 2014 18:00:10] << >> Press any key to abort autoboot 0 > boot netbsd Trying BOOTP (Admittedly, the comamnd-line syntax could use improving. :-) /~\ The ASCII Mouse \ / Ribbon Campaign X Against HTML mouse at rodents-montreal.org / \ Email! 7D C8 61 52 5D E7 2D 39 4E F1 31 3E E8 B3 27 4B

11 years, 11 months

2
1
0 0

Dynabyte Memory board in Northstar Horizon debugging

by ian＠platinum.net

Hello All, I recently acquired a Northstar Horizon machine that didn't have any memory boards. I also received a Dynabyte 800589-G 64k dynamic RAM board. Unfortunately, there is no documentation on this board (other than a single set of jumper settings for use in a Dynabyte 5505 computer - http://bitsavers.informatik.uni-stuttgart.de/pdf/dynabyte/404512A_5505_Comp… ) So far, I have the Northstar rebuilt (power supply tested, capacitors reconditioned, IC legs cleaned, etc). I added the components to install a boot PROM on the Z80 CPU card, and I can successfully boot up to a monitor ROM. From here, I can examine and deposit memory and ports. From this, I can determine that I appear to have a problem with the Dynabyte card, assuming I've reverse engineered the jumpers. The jumpers allow me to enable/disable 4 banks of 16k at 0000,4000,8000,C000. I can either have the bands be there on reset, or switch them on/off by setting/resetting bits in a bank select port that can be defined. I can successfully switch on/off banks from the monitor (visible with the LEDs on the board, as well as seeing 00 or a random value instead of FF in the memory location). However, when I try to write any value, I always write FF. Refresh appears to be working, because any FF I deposit will stay there for hours. This is really tough because I don't have a schematic for the memory board. Are there any S100 experts that could point me in a direction to start looking? Port I/O is working (to the serial port as well as to the bank select port). Memory read appears to work, because I get values that are consistent (the RAM will sometimes boot up with random values, and the random value will stay that way in that memory location until I attempt to write anything to it, then it goes FF). It appears to be a write issue. I've enabled a wait state on the CPU in case it was a timing issue, but no difference. I'd appreciate any suggestions on where I should put my logic probe :) Image of the memory board here if interested: http://www.broadbandpig.com/?attachment_id=51 Ian

11 years, 11 months

2
3
0 0

Sun Type 4 keyboard

by sales＠elecplus.com

Who was it that wanted the Sun Type 4 keyboard? I have one here, complete with cable, but no way to test it. Looks to be in good condition. First $25 including shipping slowboat to lower 48 states takes it home.. Cindy Croxton Electronics Plus 1613 Water Street Kerrville, TX 78028 830-792-3400 phone 830-792-3404 fax sales at elecplus.com AOL IM elcpls

11 years, 11 months

1
0
0 0

VAXstation 4000/60

by cruff＠ruffspot.net

On Jul 6, 2014, at 11:00 AM, John Ames wrote: >> I figured out the problem with test /util command. The problem with the SHOW >> KBD still exists. > I could be wrong, but I thought that command only deals with > directly-attached DEC keyboards when using the keyboard/mouse/video as > the terminal? I don't think it does anything with a serial-port > console. I'll try and remember to check on mine this week. I tested today, and with the serial console, SHOW KBD does display the error message. When configured to use the graphic console and DEC keyboard, the ROM prompts for the keyboard language (3 for English) and displays that in response to SHOW KBD.

11 years, 12 months

2
1
0 0

DEC 8881 OC Bus Driver Chips

by michael.99.thompson＠gmail.com

I hate to open this discussion again, but Jack Rubin and I are both repairing DEC Omnibus boards and need some DEC 8881 driver chips. Since my PDP-8/e only has a 20 slot backplane and only has a few boards installed I will try a lower drive SN7401 in place of the DEC 8881. -- Michael Thompson

11 years, 12 months

3
2
0 0

Dynabyte Memory board in Northstar Horizon debugging

by ian＠platinum.net

Hello All, I recently acquired a Northstar Horizon machine that didn't have any memory boards. I also received a Dynabyte 800589-G 64k dynamic RAM board. Unfortunately, there is no documentation on this board (other than a single set of jumper settings for use in a Dynabyte 5505 computer - http://bitsavers.informatik.uni-stuttgart.de/pdf/dynabyte/404512A_5505_Comp… ) So far, I have the Northstar rebuilt (power supply tested, capacitors reconditioned, IC legs cleaned, etc). I added the components to install a boot PROM on the Z80 CPU card, and I can successfully boot up to a monitor ROM. From here, I can examine and deposit memory and ports. From this, I can determine that I appear to have a problem with the Dynabyte card, assuming I've reverse engineered the jumpers. The jumpers allow me to enable/disable 4 banks of 16k at 0000,4000,8000,C000. I can either have the bands be there on reset, or switch them on/off by setting/resetting bits in a bank select port that can be defined. I can successfully switch on/off banks from the monitor (visible with the LEDs on the board, as well as seeing 00 or a random value instead of FF in the memory location). However, when I try to write any value, I always write FF. Refresh appears to be working, because any FF I deposit will stay there for hours. This is really tough because I don't have a schematic for the memory board. Are there any S100 experts that could point me in a direction to start looking? Port I/O is working (to the serial port as well as to the bank select port). Memory read appears to work, because I get values that are consistent (the RAM will sometimes boot up with random values, and the random value will stay that way in that memory location until I attempt to write anything to it, then it goes FF). It appears to be a write issue. I've enabled a wait state on the CPU in case it was a timing issue, but no difference. I'd appreciate any suggestions on where I should put my logic probe :) Image of the memory board here if interested: http://www.broadbandpig.com/?attachment_id=51 Ian

11 years, 12 months

2
1
0 0

Reading 3B1/PC7300 floppies?

by cclist＠sydex.com

Howdy, A couple of DS2D 5.25 floppies landed on my desk from an AT&T Unix PC/3B1. As I understand it, these are essentially UFS beasts. (I have both 8 and 10 sector ones; neither appear to be bootable). Are there any utilities out there available to digest these things? If not, I suppose I can write one. TIA, Chuck

11 years, 12 months

5
5
0 0

VAXstation 4000/60

by commodorejohn＠gmail.com

> I figured out the problem with test /util command. The problem with the SHOW > KBD still exists. I could be wrong, but I thought that command only deals with directly-attached DEC keyboards when using the keyboard/mouse/video as the terminal? I don't think it does anything with a serial-port console. I'll try and remember to check on mine this week.

11 years, 12 months

1
0
0 0

VAXstation 4000/60

by cctech＠beyondthepale.ie

> >i have here a VAXstation 4000/60 with a VT100 Terminal attatched the >serial console. >In >>> console mode are some commands not availible and i can not figure >out why. > >I want top set kbd to 1 . >>>set kbd answer is ?23 ILL CMD. Also by >typing set kbd 1. >The test / util commands do not work also... > >I tried to set a password. Type set pse 1. Login. But there is even the >same isue. > >Any Ideas what is happen? > Make sure the VT100 is set to 9600 baud, no parity. I tried with my VAX 4000/100A (KA52-A) and I get similar errors if I connect to it using a terminal emulator set to odd parity. Regards, Peter Coghlan.

11 years, 12 months

2
1
0 0

PDF of a OSI 527 RAM expansion board manual?

by terry＠webweavers.co.nz

The title says it all. I'm looking to repair/configure a OIS 527 24k RAM board for my Challenger 4P. Anyone have or know of the existence of a manual for this board? Thanks Terry (Tez)

11 years, 12 months

2
5
0 0

VAXstation 4000/60

by marco＠familie-rauhut.eu

Hi i have here a VAXstation 4000/60 with a VT100 Terminal attatched the serial console. In >>> console mode are some commands not availible and i can not figure out why. I want top set kbd to 1 . >>>set kbd answer is ?23 ILL CMD. Also by typing set kbd 1. The test / util commands do not work also... I tried to set a password. Type set pse 1. Login. But there is even the same isue. Any Ideas what is happen? Marco

11 years, 12 months

1
0
0 0

Counterfeit ICs, was Re: 6809 vs. 6809E

by mike＠fenz.net

In most cases, I find the remarked ICs are actually OK. They're obviously fakes still (commonly the origin printed on the top is different to the origin in the casting on the bottom), but functionally they're fine. This puzzled me initially, but I asked one of the sellers about this, and he said that it was done because the process of removing the ICs from the boards often marks or damages the printing. So the standard process involves remarking, straightening the legs to factory original angles, and re-tinning. It results in used ICs that look new. Sometimes they're sold as 'remanufactured' (which is sort of accurate), other times they're sold as new, which is obviously untrue. I'm not that bothered so long as they work, though I probably should complain about it. On 3/07/2014 9:03 a.m., Tony Duell wrote: > This is becoming real problem. The remarked devices, of course, have no relation to what they claim to be, they can't possibly work. Heck, I once enqired about a replacement for an HP custom IC and was asked 'what package, and how many pins'. Given this device had only ever existed in one pacakge, with one particualr pin count, it wa obvious I was goign to get a fake. I do wonder why they botyher. They can't make that much money selling to hobyists, surely no commercial company wants such fakes. > >> I spent a while looking >> over the datasheets of the 68B09 as compared to the 68B09E. It's obvious >> that there's some difference in the way the timing works, but I haven't >> been able to come to any firm conclusions what the exact difference is, >> and what purpose it serves. The best I can do is that it's related to >> synchronization with some external devices. > > he difference is where hte clock circuitry is. > > The 6809 (normal and E_) need a pair of clocks in hase quadrature. The E > clock (Enable) and the Q clock (Quadrature). FWIW, the 'clock rate' of > the 6809 is specified as the frequency of these clocks > > The 6809 (on E) has an internal clock generator. It can be driven by a > crystal of 4 tiems the CPU clock rate (soe a 68B09 can use an 8 MHz > crystal). The E and Q pins o nthe chip are outputs > > The 6809E (E=External) has no internal clock generator. The E and Q pins > are inputs, to be driven by an extgernal circuit that produces the > approrpatie signals in phase quadrature. > > IIRC, i f you use the 6883 SAM (DRAM controller) you prettty much hace to > use the 6809E. The SAM generates E and Q, and expsects to eb able to > synchroinse the CPU to them. > >> So - can anyone explain >> the difference, in terms that aren't too hard to understand? And - is >> there any hope of modifying a machine that would normally require a >> 68B09E to be able to use a 68B09? > > That depends on the circuitry around the CPU. However, if it sues the > 6809E CPU, it's a fair bet it is goign to do oomething odd with E or Q > (perhaps stretchign one of them when acessing slower memory or > something). In which case, tryign to use the plain 6809 is goignt to be a > lot of owrk. The 6809E was origianlyl chosen for a reason, after all (and > I doubt it was cost, the cost of the external clock curcuit would > outweight any difference in price of the 2 chips when new), so the reason > is more likey that said clock circuit does soemthing extra that can't > easily be done wit hthe plain 6809. > > -tony

11 years, 12 months

2
1
0 0

6809 vs. 6809E

by mike＠fenz.net

Yes, I'm certain it'd be possible. All the digital components are very standard, apart from the later WPC system, which includes an undocumented ASIC. I think producing a working CPU would be a good first step though. Then, if I'm keen, I could try integrating all the I/O etc and see what happens. On 2/07/2014 5:04 p.m., ben wrote: > On 7/1/2014 10:39 PM, Mike van Bokhoven wrote: > >> I don't think the requirement is there yet. 68B09Es are still >> available; they're getting a bit more expensive, but you can still pick >> them up for under $10 without too much trouble. They don't fail that >> often either, failures usually seem to be in the RAM, 6821s, sockets >> etc. When you say 'use a small FPGA development board', do you mean to >> emulate the entire controller board, or just the CPU? Just curious what >> you had in mind. > > I have seen the 6809 color computer emulated as well as the SWTP 6800 > on a FPGA. The only thing lacking is GOOD I/O for the devices as > most FPGA's have just a SD card interface for I/O. > Ben.

11 years, 12 months

1
0
0 0

HP3000 Available

by leec2124＠gmail.com

Hi all, FYI I am starting to trim down my collection and have listed my running HP3000 Micro3000XE system on EBay, auction number: 221481360061 Classic 3000 with lots of spares and software included. Email with questions or for a detailed spreadsheet of items. Thanks! -- Lee Courtney

11 years, 12 months

2
2
0 0

cleanout in Uruguay

by sales＠elecplus.com

. The man's name is Jonathan Gill, email <mailto:jmhgill at hotmail.com> jmhgill at hotmail.com. . I will be out of pocket for the next couple of weeks, please contact him directly if you are interested in any of his stuff before it becomes landfill. Cindy Croxton Electronics Plus 1613 Water Street Kerrville, TX 78028 830-792-3400 phone 830-792-3404 fax sales at elecplus.com AOL IM elcpls

11 years, 12 months

1
0
0 0

OLD computer stuff in Uruguay, he will ship to end users

by sales＠elecplus.com

Hi Cindy, I'm having a big clearout of my shed here. There is all kinds of stuff from cp/m, xt, 286, 386sx, 386, 486sx,486, 586amd, k62,P1, pII,P3,P4,Athalon y Sempron. There are mothers, micros, ram, fdd, hdd, cd power supplies, cabinets -you name it I probably have it. So if you have a wish list of any old stuff let me know before it becomes landfill ! Please email me if you want his email address, he will ship. Will sell tested and untested. Also has 360KB and 1.2MB floppies, not yet tested, lots of them. Cindy Croxton Electronics Plus 1613 Water Street Kerrville, TX 78028 830-792-3400 phone 830-792-3404 fax sales at elecplus.com AOL IM elcpls

11 years, 12 months

1
0
0 0

Multi-Precision Unsigned Integer Multiply and Diivide

by jhfinedp3k＠compsys.to

Just to make sure for anyone who is reading, this code will be for a PDP-11 which supports 16-Bit values. About 10 years ago, I produced some rather complicated subroutines for multi-precision Unsigned Integer Multiply and used inverse Multiply to effectively produce Divide. Since they were mostly for a minimum of 128-Bit and larger arithmetic, I felt that they were reasonable as a first effort. More recently, I find that I now need a small and reasonably efficient routine (both in code size and efficiency - assume the extra multi-integer instructions MUL and DIV are present) to Encode 32-Bit (perhaps up to 48-Bit, but certainly no larger than 64-Bit) Unsigned Integers - which requires effective division by TEN. I already have very simple alternatives which can perform Unsigned Division of 32-Bit Unsigned Integers (and by extension 48-Bit Unsigned Integers); they either require lengthy one bit at a time manipulation for all 32 bits or a table for subtracting all of the 9 powers of TEN vs all of the 32 Bit Unsigned Integer. Since I already MUST have a subroutine to Encode a 16-Bit Unsigned Integer, that is the acceptable starting point at the present time. The alternative I am using right now is to (R0,R1 holds the 32-Bit Value): Cmp #4999.,R0 ;5000.*65536.=327680000. Bhis 110$ ;Branch if DIV will not overflow 10$: ; Subtract 100,000,000 up to 42 times ;..... 110$: Div #10000.,R0 ;Get two values to Encode ;..... As long as the 32-Bit value is less than 327,680,000 (which means that R0 is less than 5000 - if you divide 327,680,000 by 65536, you get the high order portion of the 32-Bit value - otherwise the quotient overflows), the Div #10000.,R0 can be used. That results in three cases for any Unsigned 32-Bit Integer: (a) Less than 65,536 which is just the remainder, R1 to Encode (b) Less than 327,680,000 which uses the DIV to produce both the quotient, R0, and the remainder, R1 to Encode (c) Less than 4,294,967,296 (which is one more than the maximum for an Unsigned 32-Bit Integer) for which I subtract 100,000,000 up to 42 times (rare and quite acceptable), Encode that value, then finish by taking care of the remainder of up to 99,999,999 using (b) above. Note that the number of subtractions can be greatly reduced (to 12 times or less) if the first subtractions are for 1,000,000,000 Is there some (relatively simple and code size efficient) algorithm that can use the SIGNED PDP-11 DIV instruction for values that are equal or greater than 327,680,000 so that ONLY 16-Bit values need to be Encoded? OR, if the 32-Bit value is first shifted, is there some value that I can use to MUL or DIV with to obtain the first value under (c), i.e. the upper two digits for the HUNDREDS of MILLIONS and BILLIONS without having to subtract up to 42 times (or even 12 times)? For example, if just the upper portion of the 32-Bit value, in R0, is divided by 1525, the result will usually be the required upper two digits, but as each multiple of 100,000,000 is closely approached, the result will (rarely) be one too high. Dividing by 1526 produces a result which will (rarely) be one too low. Perhaps there is an algorithm that will always be correct and the multiple subtract is not needed? Maybe someone has found a correction factor which uses the remainder of the DIV by 1526 plus the lower portion of the original 32-Bit value, in R1, to correct the result when that result is one too low. Just thought I would ask to see if anyone else already found a much better algorithm. Jerome Fine

11 years, 12 months

1
0
0 0

DEC VTs , VRs, and LAs

by useddec＠gmail.com

My crew is supposed to start on my last storage unit, 25 ft, next week or so and be done before school starts. There are about 30 or more VTs, VRs, and LAxxs close to the door, I would really like to sell most of them. Most worked about a year ago, except for the VT340s and VT340+s. There are several almost complete LA210s, and should be complete LA12s, 50s, 75s, 100s, 120s, LS120s and maybe others. There are no VT05, 50, 52, 55, 61, 72,or 100s at this time. Everything is newer except a few WT and / or WD78. most can be shipped, but cost a bit, especially vrc21s. I have a lot of LA120 and other parts. I also have new tubes for the VT330s and 330+s , all three colors, which may fit in other terminals. Please contact me off list. Shipping from IL, 62853. Pickup is great. Thanks, Paul

11 years, 12 months

1
0
0 0

HP-1000 Minicomputer System (w/DEC RL02) Guidance

by christopher.parish＠parishcomputers.com

I wasn't expecting such an enthusiastic response, thanks everyone! Right now, I'm focused on getting the RL02s back in proper working order. Both drives have worn spindle ground brushes (the little graphite conical things under the spindle) and I'm looking around for replacements. Graphite is neat in that it's a conductive, self-lubricating material. There are a few places that will manufacture custom graphite parts that I'm looking into, but it will likely need to be a bulk order to make it economically effective (and it may still be obscene). An alternative material is brass. That part is affordable in small quantities ($30ish for 1). It's still significantly softer than steel, but friction and galling could be a problem. > You may want to consider using clang instead of gcc for your compiler. Thanks for the info. After looking at the software architectures more closely, I really do like how de-coupled and abstracted everything is in LLVM/Clang. When it gets to that point, that's what I'll use. > Have you seen Reinhards work? Not quite what you are doing but > maybe it can be of help. > http://www.pdp11gy.com/indexE.html#file:///E:/homepage/indexE.html That was one of the first things I saw in Google when I originally researched the disk interface. There's plenty of good information there about the packs and the drive communication. Between that and the bitsavers technical manual, I think I have everything I need. I foresee some irony involving an emulated RL02 connected to an emulated RL02 controller... > But to be honest, I don't see the logic in using an RL02 on an HP-1000 system in the first place. It all comes down to price and technical challenge. Original accessories are hard to find, and the ones I have seen are very expensive. By comparison RL02s are everywhere and packs cost almost 10 times less, but that's not the *real* reason. By day, I am a freshly minted computer scientist, but I find far more enjoyment developing system level stuff. I love vintage computing, and what better way to spend my off-hours than using super-modern technology to add new features to these landmarks of computing? In order to develop an interface between the HP and the RL02, I've had to learn all sorts of things about Verilog, timing closure, proper design constraints, etc. For me, it's the best of both worlds. I get to play with computers that are older than I am (don't judge me ;) ) and learn marketable skills that should help me down the road. Christopher

11 years, 12 months

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6809 vs. 6809E

by mike＠fenz.net

A question for someone with specialist knowledge in 6809s. I work on pinball machines a lot, and the 68B09E is a commonly used CPU. Unfortunately, it's getting harder to find 68B09Es (though by no means impossible quite yet). It seems that most of them on eBay are counterfeits; the last lot I bought were all fake, marked Japan on the front, but China on the back. They looked very convincing, with the markings etched very nicely, rather than printed. Unfortunately, they didn't work. Overall, it looks like getting 68B09Es is becoming harder, and I'm wondering if there's some alternative. I spent a while looking over the datasheets of the 68B09 as compared to the 68B09E. It's obvious that there's some difference in the way the timing works, but I haven't been able to come to any firm conclusions what the exact difference is, and what purpose it serves. The best I can do is that it's related to synchronization with some external devices. So - can anyone explain the difference, in terms that aren't too hard to understand? And - is there any hope of modifying a machine that would normally require a 68B09E to be able to use a 68B09?

11 years, 12 months

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6809 vs. 6809E

by mike＠fenz.net

Now there's a suggestion that has my attention. I have thought about this before, but I have no FPGA experience at all, and wouldn't know how to start. If it's just a matter of taking a a core model, setting it up for the target device (assign pins etc.), and writing it, I'm sure I could cope with that. But I suspect I'm simplifying things greatly there. It'd also depend on whether a 6809 model would make it obvious how to get at the LIC and TSC signals. Maybe there's someone on this list who I can pester with questions? On 2/07/2014 3:19 p.m., David Riley wrote: > My advice, faced with a dwindling supply of pulls (you > used to be able to buy 'em by the bushel from Jameco) > is to consider making a drop-in replacement using > one of the many VHDL/Verilog models now available and > a cheap, tiny FPGA like the MAX II (which Altera likes to > call a CPLD, even though it really isn't) mounted on a > DIP carrier board. > > I wonder if there's a market in that for the arcade community... > > - Dave

11 years, 12 months

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DECwriter III LA120 ribbons?

by bob＠jfcl.com

Does anybody have a source or replacement for LA120 DECwriter III ribbons? I've actually got about 8 "new old stock" ones, still shrink wrapped, but all that I've tried are pretty much dried out despite the shrink wrap. They barely make a mark on the paper, even with the little print impression lever cranked all the way up. Thanks, Bob

11 years, 12 months

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VCF East 10 aka "VCFeX"

by evan＠snarc.net

Mark your calendars: VCF East 10.0, aka "VCFeX", will be April 17-19 next year.

11 years, 12 months

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6809 vs. 6809E

by mike＠fenz.net

I don't think the requirement is there yet. 68B09Es are still available; they're getting a bit more expensive, but you can still pick them up for under $10 without too much trouble. They don't fail that often either, failures usually seem to be in the RAM, 6821s, sockets etc. When you say 'use a small FPGA development board', do you mean to emulate the entire controller board, or just the CPU? Just curious what you had in mind. On 2/07/2014 3:41 p.m., ben wrote: > I thought the arcade market would use a small FPGA development board. > Note small is relative here.

12 years

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6809 vs. 6809E

by mike＠fenz.net

Yep, I'm hoping that I might get away with a few adjustments on the clock side of things. It all depends on those signals that aren't brought out on the 6809. Will find out, hopefully tonight. On 2/07/2014 3:04 p.m., Brian L. Stuart wrote: > Without seeing the full design, I can't really say. However, I > encountered the whole issue when doing a 6809 SBC and did > end up converting what I had originally designed for 6809Es to > 6809. I did the second rev of the board with jumpers so you could > use either one. If none of the rest of the machine uses any of > the processor signals that are unique to the E part, then making > the changes to use a 6809 aren't too major. How feasable it is > in practice really depends on the rest of the design. > > BLS

12 years

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6809 vs. 6809E

by mike＠fenz.net

A nice simple explanation - thanks! So 34 and 35 are effectively output on the 6809, and input on the 6809E. No problem there, but it looks like LIC and TSC (38 and 39) not being available on the 6809 would be an issue. I might take a look over a few designs (Williams WPC, Data East audio processor, Williams audio processor) and see if they make use of those. I expect they do... On 2/07/2014 2:56 p.m., Eric Smith wrote: > The 68x09 (no E suffix) has an internal crystal oscillator circuit (pins 38 and 39) and generates the required quadrature clock (E and Q, pins 34 and 35). The 68x09E requires an external quadrature clock input (E and Q, pins 34 and 35), and uses pins 38 and 39 for other functions (LIC and TSC, respectively).

12 years

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9-Track Tape Questions

by michael.99.thompson＠gmail.com

> From: healyzh at aracnet.com > To: cctalk at classiccmp.org > Cc: > Date: Mon, 30 Jun 2014 11:39:35 -0700 > Subject: 9-Track Tape Questions > Asking for a friend... > > Is it possible to still get new BOT markers? If so, does anyone know a > source? Can markers from Audio tapes be used? > > Also, does anyone have a list of common error codes from 9-Track tape drives? > > Zane I bought a roll of audio ones here: http://usrecordingmedia.com/netmerefoset.html They work find on the 7-track TU20 at the RICM. -- Michael Thompson

12 years

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Classic Computer Gaming Communities

by jam＠synthetica.org

Hi Everyone, I know this is slightly off topic, but I'm wondering if anyone knows of, or is a member of, any mailing lists that are related to computer games, preferably older, but with the same quality as this list. Thanks for your time and happy hacking. - Josh

12 years

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Fwd: [comp.sys.cdc] Re: Chippewa Labs Rollcall, June-December 1964

by legalize＠xmission.com

This message has been forwarded from Usenet. To reply to the original author, use the email address from the forwarded message. Date: Mon, 30 Jun 2014 14:01:00 -0700 (PDT) Groups: comp.sys.cdc From: mmccrossen at arletak8.net Subject: Re: Chippewa Labs Rollcall, June-December 1964 Re: <3cc1ca19_2 at news.iglou.com> Id: <f5640b38-afa0-42a6-a760-e121353fbd61 at googlegroups.com> ======== My dad, Garner McCrossen was the main FORTRAN programmer from what I've been to ld (other than Seymour). I had lunch with Les Davis, Edna Bunn, and Verene Cray last year (2013) and Les is a gold mine of early Cray history. Please do not use the email address above. pdxmelinda @ comcast.net is best.

12 years

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Texas Instruments TI-99/4a

by bobvines00＠gmail.com

> Date: Mon, 30 Jun 2014 11:41:45 +1200 > From: Terry Stewart <terry at webweavers.co.nz> > > Hi Mark, > >>You said that the computer was promoted by the "late" Bill Cosby. >>That must be news to him, as he is very much alive. ( > > Yea. LOL. I actually meant "late-70's comedy icon" but it can be > interpreted as "the late 1970s icon...". You can't see the hyphen in > audio. Someone pointed this out when the video first went up. If you run > that part of the video now, you'll see I've got an annotation in the top > right hand pointing out what I meant! I almost made the same mistake in understanding you, but since I knew he was still alive, I thought for a second and realized that you were using the (hidden) hyphen. > >>There was absolutely no way to actually get into the innards of the >>machine as the BASIC had no peek or poke commands. > > Indeed. This is what confused me about the sprites. I confused "no user > generated sprites" (under standard BASIC) with no sprites at all. I > corrected this mistake via annotation in the video too. However I > understand Peeks and Pokes were available via the Extended BASIC cartridge. > > I didn't now about the heating problem. Interesting. > > Terry (Tez) Bill was pretty popular in the mid-to-late '60s too. I remember listening to a friend's parent's Bill Cosby LP with the "chocolate cake for breakfast" routine on it back then. It's still funny today, like pretty much all of his stuff which didn't require crudity or profanity to attract audiences. I'm not against crudity/profanity in general, but some so-called "entertainers" go a bit too far I think, trying to out-cuss each other. To get back on topic, I've got two (or one and a half TI-99/4As, depending on how you count the parts machine). Now I'll have to dig them out and try to program/play with them using the TV set I saved for the C-64 I've got. I've got one other (physically) smaller machine, maybe a Sinclair or similar that requires a TV set as a display. Everything else either required a "real" terminal (PDP-8 "Family", PDP-11 [Q-Bus machines], VAX-4000/200 [I think]) or came with a "CRT/monitor" of one type or another (B/W, Apple III display, CGA, VGA, etc.). <I'll duck now in case I've mistakenly misused any religious terminology in the sentence above.> Bob

12 years

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9-Track Tape Questions

by healyzh＠aracnet.com

Asking for a friend... Is it possible to still get new BOT markers? If so, does anyone know a source? Can markers from Audio tapes be used? Also, does anyone have a list of common error codes from 9-Track tape drives? Zane

12 years

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Texas Instruments TI-99/4a

by terry＠webweavers.co.nz

My take on the Texas Instrument TI-99/4a. Remembered most as being on the wrong side of a discounting war with Commodore but a classic computer of the early '80s nonetheless. http://youtu.be/p6VjsVwRXYk Terry (Tez)

12 years

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Looking for a few HP 7470 plotter pens

by classiccmp＠philpem.me.uk

Hi guys, Does anyone know of a (preferably UK/EU) source of HP type plotter pens, suitable for the 7470A pen plotter? It seems most of my coloured pens have dried out while the plotter was in storage, leaving me with a single pack of Roland XD-4SPA 0.2mm black pens and a couple of of unbranded, considerably thicker black pens. Failing that, it looks like I might be looking for a Linux-based alternative to John Miles' "7470.EXE" plotter emulator... Thanks, -- Phil. classiccmp at philpem.me.uk http://www.philpem.me.uk/

12 years

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Heath 85-2031, 2) 85-2000-2 Parallel I/O

by useddec＠gmail.com

I'm trying to find the top of me desk and found these. I'm sure I pulled them for someone, but can't remember who. Any interest? Please contact me off list. Shipping from 61853, IL Thanks, Paul

12 years

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TextEditors.org

by lproven＠gmail.com

Enjoyable Wiki with not only details of lots of editors classic and modern, but some history and stories which I found really interesting. http://texteditors.org/ -- Liam Proven * Profile: http://lproven.livejournal.com/profile Email: lproven at cix.co.uk * GMail/G+/Twitter/Flickr/Facebook: lproven MSN: lproven at hotmail.com * Skype/AIM/Yahoo/LinkedIn: liamproven Cell: +44 7939-087884

12 years

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1980s IBM PC Printer Stand Smoked Plexiglass by BettysBuys on Etsy

by mcarpenter4＠triad.rr.com

Hi, Curt, I noticed that you were looking for this a few years ago. I have one for sale on Etsy. https://www.etsy.com/listing/194699669/1980s-ibm-pc-printer-stand-smoked?re… Maribeth

12 years

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Classic 16-Bit Stack Architecture HP3000

by leec2124＠gmail.com

Any collectors with Classic HP3000s on the list? Please drop me a note off-line - lee_courtney at acm.org Thanks! -- Lee Courtney

12 years

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MINCE editor (Emacs clone) for CP/M

by spacewar＠gmail.com

Is there any way at this late date to acquire a copy of Mark of the Unicorn's MINCE editor for CP/M? While it originally was supplied with partial source, it's rumored that full source might have been available later. Back in the day I used Wordstar in non-document mode, but in 1984 my fingers were retrained for Emacs and now I have almost as much trouble with Wordstar as with vi. (You can't spell "evil" without "vi".)

12 years

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Wanted: SPARCstation 5, 10, or 20

by krfkeith＠gmail.com

I'm looking to buy a SPARCstation 5, 10, or 20. I'd also be interested in one of those Sun PS/2 adapters, if anyone has any. I'm located in St. George, UT (about 2 hrs Northeast of Las Vegas) so if you're close by, I'd be doubly interested! Let me know. -- Thanks, Kevin

12 years

10
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