Method (2) might be simpler: merge the player's displaybuf with our rectangle before blatting. A lessor known "secret" of the hijack method is that the player continues to update the "screen" even while we are running -- except its updates never make it to the blatter.

I think method 2 was already tackled in the 1.03 days to provide a clock when none existed. Take a look at this thread. I'm also attaching the source diff for empeg_display.c

BTW I didn't write this but I toyed around with it and got it working at one point.

-Tony
MkII #554