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From: ephraim@wang.UUCP (pri=8 Ephraim Vishniac x76659 ms1459)
Newsgroups: net.micro.mac
Subject: Re: Configuring the SCC chip on the Mac
Message-ID: <816@wang.UUCP>
Date: Thu, 5-Jun-86 08:30:24 EDT
Article-I.D.: wang.816
Posted: Thu Jun  5 08:30:24 1986
Date-Received: Sat, 7-Jun-86 08:49:51 EDT
References: <676@ur-helheim.UUCP>
Distribution: net
Organization: Wang Labs, Lowell MA
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>     I'm engaged in some research in networking and I need to use the
> Mac as an experimental node. My problem is that I have to reconfigure
> the Zilog 8530 SCC chip that controls the printer and modem ports. Here
> are some questions I have, which I would appreciate answers to:
> 	1) How many SCC chips are there in the Mac? Does one chip
> 	handle the printer and modem ports AND the mouse?
> 
> 	2) Are the physical addresses of the various registers on the
> 	chip documented anywhere? Indeed, is there ANY documentation
> 	that will ease my task?!
> 
The use of the SCC chip in the Mac is reasonably well documented (addresses,
interrupt vectors, and all) in the Hardware chapter of Inside Mac.  This
chapter was first published as part of one of the software supplements and
also appears in the bookstore edition.  It was not in the "Phone Book"
edition.  I *think* Hardware is in volume three, but check the index.

Ephraim Vishniac
decvax!wanginst!wang!ephraim