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From: ln63fkn@sdcc7.UUCP (Paul van de Graaf)
Newsgroups: net.arch
Subject: Anyone have any 68070 info?
Message-ID: <189@sdcc7.UUCP>
Date: Wed, 27-Nov-85 06:16:48 EST
Article-I.D.: sdcc7.189
Posted: Wed Nov 27 06:16:48 1985
Date-Received: Fri, 29-Nov-85 10:28:00 EST
Organization: U.C. San Diego, Academic Computer Center
Lines: 15
Keywords: 68070

A recent issue of "Electronics" mentions the 68070, an enhancement of the 68000
which includes, among other things, an on-chip MMU.  It is a joint effort of
Signetics and some other company whose name escapes me at the moment.  Does
anyone know if this chip is plug compatible with the 68000?  Also, does it use
any of the microcode from the 68K?  I vaguely recall Signetics is a 
second-source for the 68K, therfore they would have a license on the technology.
Does this allow them to manufacture enhanced versions of the chip which compete
directly with Motorola?

The chip sounds like an attractive way to add an MMU to a Mac/Amiga/Atari ST.
I'm not sure if the chip has restartable instructions like the 68010, but I
should hope so.  Why bother to have an MMU if you can't handle virtual memory?
I'd appreciate any info I could get.  Thanks...

Paul van de Graaf		sdcsvax!sdcc7!ln63fkn		U. C. San Diego