6 Jul
2023
6 Jul
'23
2:54 p.m.
I worked on VDU's as an engineer in the UK before joining DEC to sell
volume VT100's in 1975
There's a mention of block on one of the cards so a block mode terminal.
That means enter data and press a key to send the lot.
The card cage could mean its emulating something.
I'd test as many capacitors as possible. PSU first and replace as required.
Run PSU and check voltages.
Check each board for power rail to ground shorts.
If ok give each board +5v on its own and see if the TTL is alive.
If theres a clock gen start there (look for a crystal can)
Loads of fans might indicate an industrial environment
At this age some TTL will have failed plus capacitors.
Rod Smallwood
On 05/07/2023 16:28, Douglas Taylor via cctalk wrote:
At first glance it reminded me of the Hazeltine 1000,
I owned one in
the early 1980's. Brutally simple terminals, I remember getting a ROM
from Jameco which allowed the terminal to display lowercase letters.
Pure luxury.
Doug
On 7/4/2023 6:57 PM, Brad H via cctalk wrote:
Hi there - not sure how much overlap there is
with vcfed's forum, but
thought I would reach out here in case. I have a terminal from 1974
(based
on date codes I've found on the motherboard). I'm unable to determine
manufacturer and that would be handy for diagnostic purposes. The
terminal
casing is made out of foam, and although there are some serial numbers
stamped around, nothing really lines up. The fans inside have zero
dust or
dirt, so I'm thinking this may not have seen much use, or may be a
prototype
or pilot for something. It does have RS232 capability. Interestingly
the
screen is set down below the keyboard so that only half of it is
visible.
My main issue right now is the PSU - I am trying to determine if I'm
safe to
attempt powering up the board (the PSU so far seems to be ok,
although some
voltages on a couple of pins are mysterious).
Anyway, on the extremely off chance anyone has ever seen one of these or
something like it.. any tips would be appreciated. If I can find a
manual
I'll feel a lot safer about turning it on.
Some pics here:
https://drive.google.com/drive/folders/1-2uEFbi3OKBYr06y6yHnygDiLMtw2Qkj?usp
=sharing
Brad
brad(a)techtimetraveller.com