21 Mar
2005
21 Mar
'05
3:53 p.m.
From looking at
the prints, I can see where the video chip pumps out H
sync, V sync, and video to
the edge fingers... the board also needs
+5, +12 and -12 (for the DRAMs, among other uses). It's been years
since I tore apart a VT100 (was turning two dead ones into one live
one), but there's nothing magical about them... the video board
schematic is in the VT278 drawings. If you didn't want to muck around
inside a real VT100, you'd need a mono video monitor that can handle
the sync rates for 80 col and 132 col, whatever they happen to be
(never poked at the video signals with an o-scope, so can't even
hazard a guess).