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From: rajiv@ur-helheim.UUCP (Rajiv Arora)
Newsgroups: net.micro.mac
Subject: Configuring the SCC chip on the Mac
Message-ID: <676@ur-helheim.UUCP>
Date: Tue, 3-Jun-86 16:35:41 EDT
Article-I.D.: ur-helhe.676
Posted: Tue Jun  3 16:35:41 1986
Date-Received: Thu, 5-Jun-86 07:23:03 EDT
Reply-To: rajiv@ur-helheim.UUCP (Rajiv Arora)
Distribution: net
Organization: U. of Rochester, EE Dept.
Lines: 26


Hi,
    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?!

	3) If any of you have attempted/succeeded in programming the
	beast and know it's quirks, I'd be grateful for any
	information. IM doesn't seem to be much help, as this is
	pretty low level assembler stuff.

Again, any info would be greatly appreciated.
-- 
						       Rajiv Arora
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