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Re: Amiga delay implementation
is%NetBSD.org@localhost (Ignatios Souvatzis) writes:
>because you need 3 hardware accesses per clkread()... how long are
>CIA accesses in the Amiga? I don't have a HRM any more...
Depends. The CIAs are accessed by standard 68000 bus cycles
(four 7MHz clocks) but there are synchronisation delays to
the local CPU bus. So a read access usually takes between 560
and 1120ns, writing depends on how the bus cycle is buffered.
A Draco, in particular one without real CIAs, is probably different.
Michael van Elst
"A potential Snark may lurk in every tree."
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