3 Aug
2010
3 Aug
'10
8:30 p.m.
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