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From: stuart@ihlpf.ATT.COM (Stu Ericson)
Newsgroups: comp.sys.mac
Subject: Re: 68030 in MacII
Message-ID: <2186@ihlpf.ATT.COM>
Date: Mon, 14-Sep-87 14:02:56 EDT
Article-I.D.: ihlpf.2186
Posted: Mon Sep 14 14:02:56 1987
Date-Received: Tue, 15-Sep-87 07:02:40 EDT
References: <2549@okstate.UUCP>
Organization: The Sage Hovel
Lines: 25
Keywords: 68030 MacII
Summary: PMMU included

In article <2549@okstate.UUCP>, norman@a.cs.okstate.edu (Norman Graham) writes:
> According to Rand Miller's artical in the September issue of Macazine, the
> "Mac II is designed so this new chip [the 68030] will pop right in to
> replace the 68020."
well, that's probably stretching it - more Motorolla's good design
[he's not a hardware man..]
> person like to comment on this?  Are the pinouts the same (implying that
> the "Harvard style parallel architecture" is not seen off chip)?

The difference in pin-outs comes from the fact that they put a subset
of the 68851 PMMU into the '030.  This means they need to have PMMU
special pins and such.  Because the Mac II has a spot for the PMMU,
it should be easy to wire up a board to map the pins of the '030
into the '020 and PMMU socket.  In fact, I've heard rumors that
Apple people in their labs have done this with sample '030s with
success.

Stu


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