Path: utzoo!utdoe!generic!pnet91!sb
From: sb@pnet91.cts.com (Stephen Brown)
Newsgroups: comp.sys.apple2
Subject: Re: Softswitches and Rom Routines
Message-ID: <473@generic.UUCP>
Date: 9 Feb 91 15:21:29 GMT
Sender: root@generic.UUCP
Organization: People-Net [pnet91], Etobicoke, ON
Lines: 19

stc7@cunixb.cc.columbia.edu (Steven T Chiang) writes:
>
>	I have a couple of questions.  Does anyone know what the
>softswitch $c0e2 does, or what information it contains?  I couldn't
>find any info about it in the firmware ref, or hardware ref.

There are 16 peripheral card base addresses. In each case you add the base
address + n0 to get the  address for a slot, where n is the slot number (1 to
7). Consider the base address $C082. This address for slot 6 is $C0E2. Since
the IIGS has something already in slot 6 (the Disk Port) you can expect that
$C0E2 is taken in the IIGS. In fact, its the Stepper Motor Phase 1 low
location. That means that when its accessed, one of the four coils in the disk
drive stepper motor turns off. Not too useful unless you access it in quick
succession (carefully timed, of course) with stepper phases 0 through 3 (C0E0
to C0E7)


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