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Newsgroups: comp.sys.nsc.32k
Subject: Re:  PC532 Expansion & other questions
Message-ID: <9011301716.AA00228@montana.portal.com>
Date: 30 Nov 90 17:16:00 GMT
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George Scolaro writes:

>On second thoughts, you will probably have trouble with timing. The 8530 is
>real slow on the bus (last time I looked), and things like ancient 8255's
>are probably even slower so you might have to jiggle with the wait pal to
>get an extra wait state or so into the peripheral accesses - have more fun!

On third thought,  you can probably get away with this on the hardware side,
but Intel's docs say something like the software must emulate the action of
the (non-existant) wait-state generator.  The usual hold-off for Intel MOS
parts is 450 ns.  I usually just used a tuned loop or an interrupt from a
timer device.  If you did not do this you can get the microcode in these parts
into some pretty exotic states.
--
J.R. (Use the Source, Luke) Stoner
  "Dying is easy,	| asgard@montana.portal.com
    comedy is hard."	| asgard@zorch.sf-bay.org