test-drb November 2011

test-drb@ccmp.vtda.org

178 participants
177 discussions

by lynchaj＠yahoo.com

Hi, I am preparing to get some S-100 6502 CPU board PCBs manufactured for the N8VEM and S100computers.com builders. These are CPU bus master only (no TMI circuitry) and include provisions for a 4K boot ROM. There is no onboard SRAM or other IO. The board includes a large prototyping area for builder customization. Assuming we can get 20 solid board builder commitments, I will place a PCB manufacturing order in the next few weeks. Please contact me by email if you are interested in participating. This is a hobbyist board built by hobbyists for hobbyists. The PCBs will be $20 each plus $3 shipping in the US and $6 elsewhere. http://n8vem-sbc.pbworks.com/w/browse/#view=ViewFolder&param=S-100%206502%2… http://www.youtube.com/watch?v=tgFUeJdO7-E Thanks and have a nice day! Andrew Lynch

13 years

APC 6808 EXORBUS board docs?

by chrise＠pobox.com

I'm looking for any documentation that might be around for APC Automation Products Company Microprocessor, PCB ASSY 0002-3768-151 which is a Motorola EXORBUS CPU board with the following goodies on it, 6808 CPU (w/ 4.000 MHz xtal) (2) 6821 PIA (4) 2716 EPROM M58725 2Kx8 SRAM 6840 timer 6850 ACIA there's a bipolar PROM too which is probably used as an address decoder of some sort. These appear to have been offered as an OEM product for integration into customer's designs rather than being some custom board for a specific purpose. Most parts are dated '83, '84. I have several of them. Any info about jumpers, address decoding or certainly schematics would be greatly appreciated! Chris -- Chris Elmquist

13 years

VCFMW6 Leftover Shirts

by silent700＠gmail.com

Now that we've all recovered from Turkey Coma and are thinking about the next holiday(s) to come, perhaps the geek in your life (that's ok if that's you) would like a rare, soon-to-be-collectable, highly fashionable souvenir T-shirt from the bygone Vintage Computer Festival Midwest 6! Here's the current list of sizes still available and links to some pics (should be updated fairly regularly:) http://chiclassiccomp.org/vcfshirts.html Shirts are $15 including shipping within the continental US. Contact me for international rates. Thanks and we hope to see you in person next year!

13 years

4000 Series CMOS Parts?

by michael.99.thompson＠gmail.com

A friend said that he has a collection of NOS 4000 series CMOS ICs. If there is any interest I will get them so they don't go in the trash. -- Michael Thompson

13 years

Surviving Pong cabinets - UK?

by jules.richardson99＠gmail.com

Query which got bounced via the NMoC mailing list - some journalist is looking for somewhere to play on a Pong cab in the UK. Does anyone keep tabs on surviving examples? I don't remember ever seeing one there over the years, but it's hard to believe that there are none left. The message just said cabinet; I'm assuming they're after an upright, but maybe the cocktail version would be acceptable too. Perhaps even a faithful replica of either would do the job as well. cheers Jules

13 years

Phone # for Joe Rigdon?

by eric＠brouhaha.com

Does anyone happen to have Joe Rigdon's phone number? I used to have it, but can't find it now.

13 years

Looks like a home brew PDP 111 here ... Soviet chips need not apply

by bfranchuk＠jetnet.ab.ca

http://porkrind.org/missives/the-core-memory-module-from-my-dads-homebuilt-…

13 years

CMD CQD-220TM problems

by fraveydank＠gmail.com

Here's a quandary that I've posted a few places, with varying success. I have a CMD CQD-220TM SCSI board (QBUS MSCP SCSI, drive and tape) which was working fine when I got it. It's now only partially functional with a few odd symptoms on my 11/23+. The basic problem is that the CPU (it's actually an embedded 8086 system) seems unstable, but in a somewhat deterministic way. I can have it copy the PDP-11 online utility into RAM and execute that, and I can perform a few operations on that before it bugs out (basically the CSR stops responding to requests and the utility hangs waiting for a confirmation code). The most interesting is when I try to run the "other utilities"; it starts up, but then crashes when trying to display the serial number. I should also mention that the UART doesn't seem to work, and I've tried both wirings (NULL modem and non) with no success. It's wired up like a standard DEC serial port (the header on the board has the same Rx/Tx and GND pins, which are all that are connected in my adaptors), so I just attached one of my adaptors to it. Here's the really interesting bit. After running over both the PDP and the 8086 side for a while with IDA Pro (which has been a lifesaver on many projects), it looks like the "other utilities" section actually talks directly to the 8086; the software on the board redirects the character output to one of the CSRs and the PDP and the 8086 converse that way. You get the same output as the UART. This is only true for the "other utilities" section, though; the rest of it executes natively on the PDP. Has anyone experienced this sort of problem with this (or a similar) card? I'm not really keen on building up a trace module to figure out what the 8086 is doing (though I have a few FPGA eval boards which would work just fine if I use SignalTap; I just don't want to go through the trouble of building it if the answer is simple). I'm honestly puzzled by this; it was working fine when I got it, and then I plugged it in after a move and no dice. I'm still banging on it with IDA pro. I hope it's not a busted PAL/GAL/PLA (of which there are about 20 on the board), because for the most part there's no way of redoing any of those without spending weeks on the assembly trying to figure out what they're supposed to do. The SCSI chip (a 53C90A) is a socketed PLCC, and they're not impossible to find second-hand, so if it turns out to be a problem there, I should be able to fix that by just throwing some money at it. - Dave

13 years

Anyone have a Hobby Board for sale (4" x 4.5" , 44 contacts, 1.56 on center contacts) wire wrap prototype board

by nick.allen＠comcast.net

13 years

Canon VP-3000 most FAQ plus other important information

by chrism3667＠yahoo.com

I have opened up my Canon VP-3000. It has an 8088. I need docs and warez. I have a boxed up set of docs for the AT & T 7300 UNIX PC. I don't want them. They're free for shippage. Let me know.

13 years

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test-drb November 2011