although its been refuted on this list, I do seem to
recall reading that plugging a 5151 into a CGA card
was catastrophic - read IMPLOSION. Alas only a
No way. Or perhaps you can explain the physcial mechanism for this.
What will happen is that the horizontal output state will be driven way
off frequency. The horizontal output transistor will fail, maybe
(although unlikely) the flyback transformer too. The CRT shouldn't be
harmed at all.
-tony