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From: gnu@sun.uucp (John Gilmore)
Newsgroups: net.micro,net.micro.68k
Subject: 68012 versus 68020
Message-ID: <1100@sun.uucp>
Date: Wed, 16-May-84 04:25:53 EDT
Article-I.D.: sun.1100
Posted: Wed May 16 04:25:53 1984
Date-Received: Thu, 17-May-84 05:38:09 EDT
References: <3302@fortune.UUCP>
Organization: Sun Microsystems, Inc.
Lines: 15

They are two different things.  The only similarity is that both
come in pin-grid packages instead of DIPs.

The 68012 is the same chip as the 68010.  When they designed the 68010
they made more signals available on pads around the edge of the chip,
but they wanted to keep it pin-compatible with the 68000, so they
didn't connect them on the 64-pin DIP package.  The 68012 has those
pads connected, giving 7 more address lines (they left out A30 -- NOT A31
-- for good reasons) plus a pin that says whether a Read-Modify-Write
cycle is in progress.  I don't have the specs handy but I think those
are the only new signals.

The 68020 is a completely new chip (CMOS, 32 bit addr and data bus,
runs much faster, etc).  There was a report on Usenet that it has seen
first silicon but I haven't seen any samples.