Colin Douglas Howell wrote:
Basically, I'd expect to see this for any driver that seems to be
"video-limited", meaning that either it has relatively little emulation
to do or that it has a large screen bitmap. Simple 8-bit machines like
the Apple 1, Colecovision, VIC-20 and TRS-80 would fall into the former
camp, while the Commodore 128, Kaypro, Macintosh Plus and Macintosh XL
are examples of the latter. The Atari 800 and 5200, on the other hand, are
complex machines with small screens, so video updates aren't the limiting
factor in their performance.
So this limitation actually would hurt efficient or simple drivers more
than inefficient or complex ones.
After a little thought, it occurred to me that there's a much simpler way
to check for such "video-limited" machines: turn off the throttle and
switch from a frameskip of 0 to one of 11, and see how much the machine
speeds up (by examining the F11 readout). Machines which are video-limited
will speed up much more than those which are driver-limited.
Colin
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