On 01-01-08 22:42, Christer Weinigel wrote:

The data sheet for the Intel M8259A says:

    End of /RD to Next Command: 300 ns
    End of /WR to Next Command: 370 ns

On the other hand, I don't know how all the i8253/i8259 clones or the
numerous variants of Super I/O chips behave.  It wouldn't surprise me
if some Super I/O chip uses the ISA bus clock to latch the values
internally so that the delay is dependent on the bus frequency instead.

I wouldn't even be surprised if most all would...

Rene.
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