16 Jul
2011
16 Jul
'11
6:29 p.m.
There was of course also the mains input connector (IEC type, fuse and
votlage selector.A 3 contact jack socket (phone socket, like a hedphone
connector) for the keyboard. And 2 BNCs.
Its been over 15 years since I last saw the back of a VT100 and my feeble
memory doesn't recall the details. However, now that you mention it, I do
remember the keyboard jack. In the event of getting a working display but
no response from the keyboard, standard procedure was to reach behind the
terminal and wiggle the keyboard connector until a click was heard from
the speaker and then try again.
One was video output, and carried the composite video signal equivalent
to that shown on the built-in CRT. The frame rate was selectable as 50
ot 60Hz in the setup. The other was video input. This was just video (not
composite video and sync), you had to sync the extranl video source to
the sync signal appearing on the video output socket. This means
displaying live TV, etc was next-to-imposible.
It never dawned on me that the 50/60Hz selection in setup was for the video
output frame rate. I assumed it was supposed to be set to the frequency of
the mains supply but I never bothered to figure out exactly what effect it
might have or why not having it set correctly didn't seem to make any great
difference. If it was marked frame rate or something like that, I would
probably have figured it out.
from plugging their thinwire ethernet segment
into the back of their terminal but
I don't remember which type. I suppose it was probably the VT100.
MAybe a VT220, whcih ahd a (composite) video output BNC socket on the
back. No video input on that one, though. I remember when I was at
Bristol we had a thinwire segment go down. After checking for sillies, I
put a 'scope on it and found the unmistakable composite video signal.
Yes, sombody had plugged a spare T-piece into the back of a VT220.
I thought hte VT220 had a setup option for 50 or 60Hz vertical too. If
so, in the former setting, it should display fien on a 625 line monitor
without any adjustments.
I just had a hunt through setup on my VT220 and I can't find a 50/60Hz option.
Regards,
Peter Coghlan.