Visual 200 (was Visual 100 Terminal - Circuit Diagram Wanted)

william degnan billdegnan at
Wed Oct 14 14:41:39 CDT 2015

Bare in mind the keyboard keys will likely have to be re-foamed.  I had to
do that with my Visual 1050, which is the full system version CP/M
computer.  I'd see if there are similarities to the 1050, I bet the video
display circuits would have similarities, you might be able to find 1050
schematics if you can't find exactly what you have.

On Wed, Oct 14, 2015 at 3:19 PM, Jonathan Chote <jonathan.chote at>

> On Wed, Oct 14, 2015 at 10:02 AM, Jonathan Chote <jonathan.chote at
>> >
>> wrote:
>> I know it exists out in the wild somewhere, but I can't find a copy
>>> myself. It's for a VT100 clone terminal called the Visual 100 - from
>>> around
>>> 1982.
>> Mistake on my behalf. Was working on it last night and it's actually the
> earlier model, the Visual 200.
> After some basic repairs to the power supply section, I now have a
> flashing "ON" light on the keyboard which I believe is an error code from
> the self test (taking queues from the Visual 100 manual).
> CPU removed - "ON" light stays lit
> CPU installed - cold start - 3 beeps, then ON light flashes
> CPU installed - less than 5 minutes since last power up - ON light
> flashes, no beeps
> Messing with the Mask ROM in it's socket also created a few scenarios with
> lots of fast beeps, and the CAPS LOCK key staying lit, but I reseated it
> and the system returned to the above situation.
> CRT section doesn't appear to start up, but didn't blow up either, so
> that's a plus. Have not had a chance to go over it with a scope yet.
> So if anyone has...
> - parts list
> - user guide
> - circuit diagram
> - a spare logic board laying around
> - or remembers anything about these terminals
> Please let me know!
> Cheers,
> Jono


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