Many years ago I was told that inserting NOPs into IIgs screen updates
could actually make things faster, because of the way the different
hardware components interact when you're doing a fast copy with shadowed >memory (insert a NOP every 8 or 13 PEIs). Somebody attached a logic
analyzer to a IIgs and timed it a few different ways, and determined
that there is actually no value to adding NOPs:
https://retrocomputing.stackexchange.com/q/228/56
Is there a flaw in their test methodology, or was this actually a myth?
A detailed waveform of 40+ PEIs (more would be better--long enough to show a pattern repeating several times) would probably be enough to show NOPs don't help PEIs.
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