test-drb June 2005

test-drb@ccmp.vtda.org

221 participants
681 discussions

by paulrsm＠buckeye-express.com

Jules wrote: > Personally I like the accountability; > I'd like to know who scanned a document, > when they scanned it, what software > they used to do the scan. As someone who scans documents and distributes the PDF's (mostly Apple II stuff), I prefer to remain anonymous. Sure, the stuff is so old and mostly the companies no longer exist, but I *am* violating someone's copyright. -- Paul R. Santa-Maria Monroe, Michigan USA

19 years, 2 months

"Pozidriv" [was Re: Tools (was: IBM 5155 analogue display fault]

by dwight.elvey＠amd.com

>From: "Fred Cisin" <cisin at xenosoft.com> > >> A Phillips bit will work moderately well on a Pozidriv screw, but the > >about as well as a butter knife works on slotted screws > Hi My first repair job was when I used a butter knife on the toaster to fix the timer. It actually worked when I was done. I was about 6 years old at the time. Dwight

19 years, 2 months

Rescued Items

by ajp166＠bellatlantic.net

> >Subject: Re: Rescued Items > From: "Jay West" <jwest at classiccmp.org> > Date: Sat, 04 Jun 2005 22:30:56 -0500 > To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> > >Allison wrote... >> Whats unusual about that? I have several of the 99/4a systems and >> a Technico SuperStarter system. If someone hadn't beat me I'd have >> asked for them. > >There's a *HUGE* difference between a TI99/4a, and a TI/990. Like about 400 >pounds :> > >Jay Yep! I want one!!! ;) On the real front I'm looking for the TI9900 (cpu chip) based stuff. They are a bit lighter. Allison

19 years, 2 months

DATA I/O 29B Modification?

by rigdonj＠cfl.rr.com

A year or two ago there was a webpage that showed how to modify the model 29B EPROM Programmer to increase it's memory to 1mb. I didn't bookmark it and how I can't find it. Does anyone know the URL for it or have a copy of it stored anywhere? Joe

19 years, 2 months

Rescued Items

by technobug＠comcast.net

While on a rescue mission this PM, I pulled out of a pile of boards destined for the gold merchant the following: DEC KDF11 Module M8186 TI 9900 Boards: TM990/101MA CPU Board TM990/314 ? (has a DB25 and an edge connector - serial?) First takes choice at $2 per board plus shipping. CRC

19 years, 2 months

A (sort of) .rss feed for Computer Collector Newsletter

by news＠computercollector.com

Hi cctalk'ers, I think it's really, really, important to make more people aware of our hobby, so I finally created an .rss feed for the newsletter. Well, sort of. Instead of syndicating ALL of the articles, I'm only syndicating summaries of each issue's highlights, with hyperlinks back to the "Subscribe here!" page. That way, newbies can get an idea of what CCN is all about, and then read more if they desire. I would be very grateful if anyone chooses to include the feed on their web sites. You'd be doing the hobby a favor. The file is http://www.snarc.net/ccn.xml ... It applies to the most recent 14 issues; each week I'll update it with the FIFO method. Also: this is my first-ever shot at doing .rss, so if you experts out there spot any obvious mistakes, please tell me in a PRIVATE message to news at computercollector.com. No need to make newbie .rss blunders into a cctalk topic, right? :) ...And now back to our regularly scheduled yapping about Nascom keyboard connectors, Pozidriv, .PDF manipulation, etc. - Evan K. ----------------------------------------- Evan Koblentz's personal homepage: http://www.snarc.net Also see http://groups.yahoo.com/group/midatlanticretro/ *** Tell your friends about the (free!) Computer Collector Newsletter - 735 readers and no spam / Publishes every Monday / Write for us! - Mainframes to videogames, hardware and software, we cover it all - W: http://news.computercollector.com E: news at computercollector.com

19 years, 2 months

Rescued Items

by ajp166＠bellatlantic.net

> >Subject: Re: Rescued Items > From: "Jay West" <jwest at classiccmp.org> > Date: Sat, 04 Jun 2005 21:56:56 -0500 > To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org> > >CRC wrote... >>> TI 9900 Boards: >>> >>> TM990/101MA CPU Board >>> TM990/314 ? (has a DB25 and an edge connector - serial?) > >Then Bill wrote... >> I'm interested in the TI boards. >> I'll also take the DEC board if nobody else wants it > >I didn't know there were other TI/990 collectors here :) Nifty! > >Jay Whats unusual about that? I have several of the 99/4a systems and a Technico SuperStarter system. If someone hadn't beat me I'd have asked for them. Allison

19 years, 2 months

DATA I/O 29B Modification?

by swtpc6800＠comcast.net

My favorite error code from the Data I/O System 19 (the predecessor to the 29) was the one when you did not have enough RAM install to program the PROM you selected. If you looked up the corrective action in the manual it said to install more RAM or program smaller parts. Michael Holley.

19 years, 2 months

SGS UX8-22 CP/M System and WD-1000 controller + Hard Disk

by spedraja＠ono.com

Well, I've read more in depth the documentation that comes with the UX8-20 and I have clear now how it manage the Hard Disk matter. In appeareance the Floppy controller can manage up to FOUR floppy disk units of 8". In addition, it has one interface with one WD-1000 controller. So, what I need is one vintage WD-1000 controller plus the corresponding Hard Disk of 4mb-5mb. I don't know in what format these items appeared years ago, but something makes me think in some kind of external enclosure with the 8" disk inside plus the WD-1000 controller, with the PSU inside and one 5-pin interface to the outside world. Is this so ? And, more important... Has someone something similar to this ? I have one shugart 8" hard disk of 8" recently purchased and in appeareance in working condition... I should need the rest. Regards Sergio

19 years, 2 months

S100 address buss troubleshooting

by dave04a＠dunfield.com

At 18:26 04/06/2005 -0400, you wrote: >All: > > After verifying the power supply, I'm now starting to play with the >system. I put in the CPU board (TDL Z80) and three 16k memory boards. >Reading and writing data to memory seems to work, but frequently I'll get >the A13 and A7 LEDs stuck ON. If I toggle RESET, the LEDs clear but on my >first EXAMINE, A13 and A7 go on. > > Things I have not done yet: > * loaded any programs or tried to verify memory fully > * cleaned any board contacts > > If I pull one of the memory boards, the A7 problem goes away but A13 >stays on all the time, leading me to believe that that issue is either on >the CPU card or the front panel card. > > How does one troubleshoot a stuck-bit problem in these systems? I do >have a 12-bit logic analyzer on a laptop (uses the parallel port) but I >haven't pulled that out yet. Rich, Check the switches - I had an IMSAI panel which exhibited the same symptom on one address bit, and it turned out that the original builder had done a very poor job of soldering the switches, and a cold solder joint was causing the switch not to pull the bit down. An easy test is to set the suspect switch and all switches BELOW it to ON, and all switches ABOVE it to OFF - perform an EXAMINE, and the lights should match the switches (all LEDs above OFF, the suspect and all below ON). The do EXAMINE NEXT which should wrap to the next bit. The suspect and all LEDs below should go OFF, and the LED next up should go on ... If the syspect LED goes OFF, then most of the panel->bus interface is working, and the problem may be a switch or early-on buffer/latch. If it stays ON then you will have to look further. Also check/clean the S-100 connectors, and the "umbilical cord" between the panel and the CPU - poor connections here can cause individual malfunctioning front panel bits. Many S-100 CPU cards have a connector for the IMSAI front panel, so if you have other systems, it may be easy for you to try another CPU - keep in mind that there is usually a jumper on the card to control the WRITE signal on the bus being generated by the CPU card or the Front panel. If the above gets you nowhere, then it's just a matter of sitting down with the schematic and a scope and following the signal from that switch all the way through to the bus at some point you should see that the zero from the switch is not making it through a component or connector. I don't recall the details of the IMSAI panel, but you might have to trigger on the read strobe to catch the signal being clocked through the panel. Regards, Dave -- dave04a (at) Dave Dunfield dunfield (dot) Firmware development services & tools: www.dunfield.com com Collector of vintage computing equipment: http://www.parse.com/~ddunfield/museum/index.html

19 years, 2 months

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test-drb June 2005