test-drb

test-drb@ccmp.vtda.org

101090 discussions

by allisonp＠world.std.com

Thus wrote: <Robert M. (Bob) Donan E-mail: donan(a)utk.edu <The Tandy TRS80 Model III, as delivered, did not come with a green <screen. Either the machine has been upgraded (requiring a different <video board) or it is not a Model III. I may be able to help you either <way as I have been repairing Radio Shack computers since 1979. You <could help me answer your questions by answering the following <questions: There were at the time several companies offering replacement CRTs to go >from white to Green or amber. they were same tube different phosphor with no other alterations required. H19s and a few other terminals/systems were modified that was as well. Robert, Did you work for tandy? I was up in PA when the TRS80 hit. Allison

28 years, 4 months

Well, the 34a is back among the living...

by dseagrav＠bsdserver.tek-star.net

IT runs again, boots RT-11. The decision to stop screwing with it came when I realized I didn't have any 18b RAM boards, and RSTS won't run in 64KW of core. (128KB). So, I'll have to get something lighter for it to run if it's to be timesharing. Or get RAM. I may do that today. All the RAM I have is 22b boards from the '44. My next project will be to get that running, then maybe the VAX 750.

28 years, 4 months

HORRAY!!! (And a little boo...)

by photze＠batelco.com.bh

I just got my XT working!!! (My first classic) Well... not really working... I get a "601 Error", and then it says "Press F1 To Resume" I remember a similiar error w/my current computer... I replaced the keyboard when all was done. Just for a little interesting bit, the manufacturer of the chip (I forget the term) on the keyboard is Zilog.... same neon light style logo as way back when. Well anyway, I would like to thank Max, who sent me the processor that got it working, (Sorry, tried to e-mail him, and got an error) and I would like to know if anyone can help w/ the 601 error. Thanks, Tim D. Hotze

28 years, 4 months

TRS 80 with Green Screen

by donan＠utk.edu

The Tandy TRS80 Model III, as delivered, did not come with a green screen. Either the machine has been upgraded (requiring a different video board) or it is not a Model III. I may be able to help you either way as I have been repairing Radio Shack computers since 1979. You could help me answer your questions by answering the following questions: 1. Does the computer have a silver or cream coloured cabinet? If the cabinet is silver in coulur, it is a Model III cabinet and the innards may have been renewed. As the Model III and Model IV (non-gate array) use the same footprint for their internal circuit boards and drive towers, they are easily interchanged. 2. If the cabinet is cream couloured it is most likely a Model IV gate-array. Robert M. (Bob) Donan E-mail: donan(a)utk.edu Graduate Teaching Associate Department of Human Resource Development The University of Tennessee 310 Jessie Harris Knoxville, TN 37996-1900 (423) 974-2574 Department. (423) 579-2808 Residence

28 years, 4 months

Lost Email, New address

by sinasohn＠ricochet.net

Well, I managed to trash my e-mail and lose everything in my inbox. (1000+ messages) So, if anyone wrote to me recently, please resend it. Sorry! Further, I am getting rid of my CRL account, so if you have my e-mail address as <sinasohn(a)crl.com>, please change it to either <sinasohn(a)ricochet.net> or <roger(a)sinasohn.com>. Thanks! --------------------------------------------------------------------- O- Uncle Roger "There is pleasure pure in being mad roger(a)sinasohn.com that none but madmen know." Roger Louis Sinasohn & Associates San Francisco, California http://www.crl.com/~sinasohn/

28 years, 4 months

Wrong Way:New Definition REQUIRED

by carl.friend＠stoneweb.com

On Wed, 19 Nov 1997 06:42:28 GMT, Bill Richman inquired: > [...] And does anyone have an Intecolor in their collection? Yep. I've got an ISC 8001 with 24 kB of user memory, 48-line option, dual 5 1/4" floppy drives, and ROM BASIC. It's a nice box. ______________________________________________________________________ | | | | Carl Richard Friend (UNIX Sysadmin) | West Boylston | | Minicomputer Collector / Enthusiast | Massachusetts, USA | | mailto:carl.friend@stoneweb.com | | | http://www.ultranet.com/~engelbrt/carl/museum/ | ICBM: N42:21 W71:46 | |________________________________________________|_____________________|

28 years, 4 months

Dilog CQ2010, what is it?

by dseagrav＠bsdserver.tek-star.net

I have an interestin quad-height board labelled Dilog CQ2010. It has a 50-pin plug (Like a SCSI plug), and a few DIP switch blocks. What is it? Anyone know?

28 years, 4 months

Talk Of Building A Computer...

by Philip.Belben＠powertech.co.uk

Kevin McQuiggin wrote: > Hi Tim: > > If you're going to try this, I'd suggest starting with something simple > like an adder or a flip flop, or a register. You'd get an idea of what > would be involved with a simple processor. But I think it would end up > being pretty expensive. [...] Tim Hotze had written: >Hello... some time ago, there was talk of building a computer, and now I >think that I've got a (bad, possibly) idea. In the earlier half of this >century, transistors weren't avaible... vaccum tubes... huge ones, but >now, the transistor has made small ones possible. My point: If we were >to take a tubed design, and re-build it with transistors, we could >probably make it a decent size. > So, what da ya think? I think there is something even more fundamental here. Valves (thermionic, in tubes) have quite different behaviour to trannies. A JFET behaves fairly like a triode, but designs that use pentodes and nonodes and things as multi-input gates are going to be very difficult to translate. Of course by the 1960s there were somve very nice valves around that weren't available to the 1940s computer pioneers - the 7586 nuvistor springs to mind: a very nice triode in a metal can about 1 inch tall including pins, and less than half an inch in diameter. Can't remember the spec, though. Such devices could make a valve machine quite a bit smaller than Colossus, Eniac, Edsac, etc. Or if you want to be way out, what about tubes with several valves in? Things like double diode triodes are quite common, and someone even put most of a radio set into one tube (passive components and all). So how about making our own. A tube containing, say, a 4-bit D-type latch? Make a few in that range and a valve computer becomes almost manageable! Besides, the smaller it is, the faster you can make it... Philip.

28 years, 4 months

Talk Of Building A Computer...

by allisonp＠world.std.com

<The main memory of the DEUCE was built form mercury delay lines of 1024 <bits, and the 1024 bit shift register chip had just become available. <The connection was obvious and we spent hours discussing the rebuilding <a TTL version of DEUCE, for which he still had the logic diagrams. Alas <the project was never completed but I have dreams of doing it one day. With current parts the Turing machine could almost be practical/useful as it would be easy to provide enough memory to simulate a very long tape and enough speed to transverse it quickly. It's been a long time since I've looked at that machine. <Take the idea even further : the technology exists today to build most <if not all first generations machines on a single chip. Indeed I wonder <if an FPGA might not be able to be reconfigurable to build many of these In most cases yes. Some are quite simple when reduced a logical description. The PDP-8 has seen this treatment many times using the 6100. 6120 and even gate-arrays. Allison

28 years, 4 months

HORRAY!!! (And a little boo...)

by SUPRDAVE＠aol.com

601 post error is a floppy drive and/or controller error. time to check your cabling and swap out parts if you have them. david

28 years, 4 months

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