Re: Mk14 vdu
I think the shuddering may be a tiny error in the sync timing. The 877 and 877A do have differences in their internal circuitry (for instance, the data sheet says they are slightly faster to program) so its entirely possible there are tiny differences in propagation delays between instruction execution and when the port actually changes, or something like that. This may be subtly exascerbating a small timing error? Pure conjecture I know but I do think there is a small snafu in the timing of the video given the original software is rock solid, as is the character mode.
Tim, not seeing the white line may just mean your TV has more "oveerscan" than Sirius's.
You're right Sirius, its really annoying not being able to help out!!!
|