Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!bloom-beacon!primerd!ENI!S34!BEAR
From: BEAR@S34.Prime.COM
Newsgroups: comp.arch
Subject: Re: Instruction (dis)continuation (
Message-ID: <261500010@S34.Prime.COM>
Date: 12 Sep 89 16:02:00 GMT
References: <2353@oakhill.UUCP>
Lines: 14
Nf-ID: #R:oakhill.UUCP:-235300:S34:261500010:000:487
Nf-From: S34.Prime.COM!BEAR    Sep 12 16:02:00 1989


It would appear that what this thread is *really* discussing is whether or
not MEMORY MAPPED I/O is a good thing. The concensus seems to be that it
should be avoided (use I/O instructions instead). If it can't be avoided,
be careful.

It may of course be that a particular machine has no special I/O instructions
(e.g. Acme RISC :-)), in which case you should "do the right thing" (most
likely a load or store).

Bob Beckwith
Prime Computer, Inc.
(508)879-2960 x 4209
bear@s34.prime.com