Date   : Tue, 06 Dec 1994 17:56:58 GMT
From   : David Alan Gilbert <gilbertd@...>
Subject: Re: BBC screen emulation

I've been thinking about emulation - and had been thinking about storing a list
of changes to video registers and when they happen and also storing a changed
flag on each
256 bytes of main ram.
Two main problems occur:
  1) Holding change info on main memory slows down memory writes.
  2) Large screen level changes are still tricky - e.g. flashing colours,
     scrolling etc. - and I suspect games change lots of lines in each frame.

Dave