1 Sep
2011
1 Sep
'11
1:23 p.m.
Right - this monitor is doing more than just rolling,
the text only appears
on the right side of the screen, and it's not stable in X or Y. I might
look at it on an NTSC monitor just to make sure the rates are right, but I
suspect that there are nasty things going on with the output. More work
required.
A small mono monitor that you _know_ can sync to US and European TV_rate
video is a very handy thing on the test bench :-)
But I think you're right, there would appear to be other faults here. At
least all the video circuitry is plain TTL so it shouldn't be hard to get
spares, and all the timing sigals (derrived from the counter chain) are
(or at least should be) repetitive, so you can sort things out iwth a
normal 'scope, you don't need storage facilities.
-tony