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From: fadden@cory.Berkeley.EDU (Andy McFadden)
Newsgroups: comp.sys.apple
Subject: Re: Serial Port Status questions...
Message-ID: <22070@pasteur.Berkeley.EDU>
Date: 13 Feb 90 23:02:45 GMT
References: <269@bucsb.UUCP> <2182@ultb.isc.rit.edu>
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Reply-To: fadden@cory.Berkeley.EDU.UUCP (Andy McFadden)
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In article <2182@ultb.isc.rit.edu> lmb7421@ultb.isc.rit.edu (Les Barstow: Phoenix) writes:
>On a similar note, could someone please send me mail on the inner
>workings of the SCC calls - specifically, I want to set up an
>interrupt-driven read from a modem....
[ snip ]
>The GS Technical Reference (not Apple's references) is more than a
>little vague on SCC programming, and I could use some major help.

The //gs Technical Reference by Michael Fischer is not only vague but
is just plain wrong in a couple of spots.  I wound up disassembling the
firmware to figure out the parameter count byte and to determine what exactly
was going on.  Finally got it to buffer the input and to do a SendQueue, but
not without a lot of hassle.

Do yourself a favor and get the Apple //gs Firmware Reference.  It has
everything you need to know about SCC calls (both standard serial port stuff
and the //gs extended calls).  It can also be vague at times (there's a few
spots where sample code would have helped - but then it is a reference
manual, right?), but there's nothing you can't figure out.

There's also a lot of good stuff about the SmartPort, interrupt vectors,
the ADB, the mouse, and others (most of which I haven't read; I bought it
from the campus bookstore last night...)

The table of vectors and the softswitch listings are also invaluable.

>Les Barstow      |RIT - A citadel of gleaming brick towering over a snowy swamp

-- 
fadden@cory.berkeley.edu (Andy McFadden)
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