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Path: utzoo!mnetor!uunet!husc6!rutgers!rochester!cornell!uw-beaver!tektronix!tekcrl!tekfdi!videovax!stever
From: stever@videovax.Tek.COM (Steven E. Rice, P.E.)
Newsgroups: comp.sys.m68k,comp.sys.amiga
Subject: Re: MC68020, Versions, and the Amiga
Message-ID: <4528@videovax.Tek.COM>
Date: Mon, 10-Aug-87 14:25:08 EDT
Article-I.D.: videovax.4528
Posted: Mon Aug 10 14:25:08 1987
Date-Received: Wed, 12-Aug-87 01:44:07 EDT
References: <5930001@hplsla.HP.COM> <963@oakhill.UUCP> <704@elmgate.UUCP>
Reply-To: stever@videovax.Tek.COM (Steven E. Rice, P.E.)
Organization: Tektronix Television Systems, Beaverton, Oregon
Lines: 32
Summary: One good, one not so good. . .
Xref: mnetor comp.sys.m68k:544 comp.sys.amiga:7313

In article <704@elmgate.UUCP>, Jeff Gortatowsky (jdg@aurora.UUCP) writes:

> I hope someone at Motorola or Commodore can help me with this.....

Will someone at Tektronix do?

> First.  I have a XC68020RC12 and an MC68881RC12A.  What does that mean?
> Umm... what I mean is, is XC a bad omen?  The 881 seems to be a production
> version.
> 
> The mask (or version, or whatever) on the 020 is 2A23G8512.  On the '881
> the mask is 1A93N8626.  Are these good parts?  Will they function together?
> I once heard a rumor (fact?) that early versions of the 020 wouldn't play
> with the 881 and had barrel shifter bugs.  True? False?

The first five characters of the string are the mask level, and the last
four are the production date.  The 68881 is good -- it is mask revision
1A93N, built week 26 (end of June) of 1986.  The 68020 is probably a dead
loss -- it is mask revision 2A23J, built week 12 (end of March) of 1985.
We have some old 0A45J mask 68020s dated 8517 (five weeks after your
68020).  The 0A45J mask was still pretty buggy.  The 68020s we are
currently receiving are the 2A70 mask revision.

Incidentally, the minimum clock spec for the 68020 (including the 12.5 MHz
version) is 8 MHz.  I assume they will in fact run at 7.16 MHz, but it
certainly isn't guaranteed!

					Steve Rice

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