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
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.
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
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
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/
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 |
|________________________________________________|_____________________|
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?
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.
<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
