Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!uwm.edu!gem.mps.ohio-state.edu!tut.cis.ohio-state.edu!ucbvax!hoptoad!tim
From: tim@hoptoad.uucp (Tim Maroney)
Newsgroups: comp.sys.mac.hardware
Subject: Re: Motorola 68851 PMMU discontinued
Message-ID: <8770@hoptoad.uucp>
Date: 21 Oct 89 21:39:50 GMT
References: <929@unsvax.NEVADA.EDU> <4195@deimos.cis.ksu.edu>
Reply-To: tim@hoptoad.UUCP (Tim Maroney)
Organization: Eclectic Software, Beirut
Lines: 27

In article <929@unsvax.NEVADA.EDU> vale@arrakis.nevada.edu (Robert Vale) writes:
>I just spoke with Bob Novis of Motorola Intra-company sales, and he told m that
>Mototola has discontinued the MC 68851 Paged Memory Management Unit.
>This is the 
>chip thet Apple uses in the Mac II for virtual memory function. He further
>said that the last sale of these chips was on May 5, 1989 for a quantity of
>two to a distributor. Currently he said, Motorola has 4 chips in stock and
>that they are located in Tokyo, Japan.

In article <4195@deimos.cis.ksu.edu> paryavi@harris.cis.ksu.edu (Saiid Paryavi)
writes:
>I just spoke to the Motorola distributor in Kansas City and they said they
>could supply as many PMMUs as I liked.  They even game me some quantity 
>discount prices.

Perhaps Vale was confusing the 68851 and the older 68451 documented in
an appendix to the old 68000 manual.  The 68451 was indeed a turkey
chip and I would be very unsurprised if it were discontinued.  It seems
awfully unlikely that the 68851 would be discontinued with the 68020
still a hot seller, and it is inconceivable that Motorola would have
received *no* orders for the 68851 in the last six months.
-- 
Tim Maroney, Mac Software Consultant, sun!hoptoad!tim, tim@toad.com

"When the writer becomes the center of his attention, he becomes a nudnik.
 And a nudnik who believes he's profound is even worse than just a plain
 nudnik." -- Isaac Bashevis Singer