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Path: utzoo!watmath!clyde!cbosgd!ulysses!mhuxr!mhuxj!houxm!vax135!cornell!uw-beaver!info-mac
From: info-mac@uw-beaver
Newsgroups: fa.info-mac
Subject: Mac memory map problems
Message-ID: <314@uw-beaver>
Date: Sun, 30-Dec-84 19:05:35 EST
Article-I.D.: uw-beave.314
Posted: Sun Dec 30 19:05:35 1984
Date-Received: Mon, 31-Dec-84 03:18:30 EST
Sender: daemon@uw-beaver
Organization: U of Washington Computer Science
Lines: 21

From: 

	Got a call this morning from Gary Landis at MicroGraphic Images.
It seems his firm is developing a hardware product that needs to use a
chunk of the 68000's address space for external decoding.  The problem is
that (according to him--I know nothing about this) the Mac OS and ROM appears
to make some use of just about every 1MB chunk of the address space. His
question:  where can he find a chunk (1MB or so) of address space that won't
cause problems with the Mac OS/ROM?  If you know, please reply to me or
give him a call directly (213-374-5832).  I know he'll appreciate it.
	Speaking of which...he told me that his firm has just annouced a
1 MB upgrade for the Mac (called the "MegaMac").  You do have the problem
of having the video screen sitting right in the middle of RAM (at $7A700),
but (he said) you can have a 512K RAMdisk *and* 512K of working space . . .
which should make Lotus' Ja\zz and similar software scream along.  He's
sending me info on it; I'll post something here once I get it.

						..bruce..

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