Geoff Winkless wrote:
> I thought the problem I was experiencing (border scrolltext
> jerking around occasionally) had stopped when I changed the
> code to use RES - but now it seems otherwise
It's quite possible that's just a visual effect caused by the monitor
sync not being a perfect match to
Geoff Winkless wrote:
> border scrolltext jerking around occasionally
It can be difficult to synchronise an interrupt routine exactly when the CPU
is busy in the foreground - when the interrupt occurs the CPU has to finish
the current instruction first. Could this explain it in your case? It's
b
Dave Laundon wrote:
> Ok, my first post here in ages, here goes...
>
> the official Z80 cycles rounded up to the next multiple of 4 (or 8 in
> screen time), or, 4 (or 8) times the number of memory accesses;
> whichever is greater.
Thanks! I vaguely remembered something like that but wasn't sure.
