6 Jun
2005
6 Jun
'05
3:38 p.m.
Part of my original point about using 4.77Mhz is that
all of the CGA cards I
ever saw had their own crystals and ignored the MB clock.
Just checked the IBM CGA scheamtics, there is no crystal shown. I've also
just pulled a couple of genuine IBM CGA cards out of my spares box, I
can't see anything that I think is a crystal on them. Ditto for a close
clone of the CGA card that I've just looked at.
-tony