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Actually, it could be misleading to say the Z80A never runs at 4 MHz, since it is clocked with a 4 MHz signal from the VIC-II. It seems like, more precisely, there are wait states introduced during every set of potential Z80A bus access cycles; though, calling this "wait states" may also be wrong or misleading too :(

Brian H
– Brian H

2017-02-27 15:56:10 +00:00
Commented Feb 27, 2017 at 15:56
1

@BrianH - Strictly speaking, you're right - but whatever was happening there, it left the Z80 performing as though it were actually running at 2MHz instead of 4MHz, which I assumed (and we know about that word) was enough to answer the question.

Jeff Zeitlin
– Jeff Zeitlin

2017-02-27 16:06:47 +00:00
Commented Feb 27, 2017 at 16:06

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