4 Aug
2010
4 Aug
'10
12:44 a.m.
Hi
Yes I probably could trace the circuit out.
But it's always worth asking as you never know who's got what out there.
Regards
?
Rod Smallwood
?
?
-----Original Message-----
From: cctech-bounces at classiccmp.org [mailto:cctech-bounces at classiccmp.org]
On Behalf Of Tony Duell
Sent: 03 August 2010 20:31
To: cctalk at classiccmp.org
Subject: Re: Pronouncing acronyms (was Re: DEC acronyms)
1. I once nearly took a job with them
2. I thought they were called Ball as opposed to Balls.
You are probslby right...
3. I have several of the Ball VT100 boards referred to
but lack a =
circuit
diagram to fix them. It would be a Ball diagram as opposed to a DEC one.
4. No, the circuit is not in any of the DEC VT100 manuals.
Hang on a second...I know from your positings here that you are
clueful.... And the VT100 video board -- any version -- is pretty simple.
So why not trace out the scheamtic. It wouldn't take more than an
afternoon...
I think all the versions of VT100 video board that I've seen use the same
flyback transfoemr (separately mounted on the chssis) which is a great
help. Figuring out the windings of the flyback is a pain, becuase they
have such a low DC resistnace that the show as a dead short on most
ohmmeter.
Desodler any low-resistnace compoennts from the PCB (inductoctors,
transfofmers, fuses, etc ) before you start, and then start tracing
connections with an ohmmeter. You amy find much fo the ciruitry is
similar to one of the boards in the manual, which is a help.
If I can mange to do machines with a couple of hundred ICs, then I am
sure yoy can manage the VT100 video board...
-tony