23 Apr
2004
23 Apr
'04
11:56 a.m.
Does anyone have any experience reviving dead VT52 DecScopes?
I'm getting a couple in unknown condition. One "lights up" and the =
other one doesn't.
From what I remmeebr the VT52 logic is somewhat strange
-- it's
essentially a simple special-purpose processor with a simple data path
and microcode in a set of PROMs to control it all. The PSU and monitor
circuitry is more conventional.
I have the prints (are they on bitsavers too?). I would start by checking
the PSU rails, then if they're OK, look for sync and video outputs from
the logic. That will at least tell you whether you have a logic or
monitor problem.
-tony