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From: alan@pdn.UUCP (Alan Lovejoy)
Newsgroups: comp.sys.mac
Subject: Re: Byte review. 386 v '020
Message-ID: <1153@pdn.UUCP>
Date: Wed, 26-Aug-87 11:17:52 EDT
Article-I.D.: pdn.1153
Posted: Wed Aug 26 11:17:52 1987
Date-Received: Fri, 28-Aug-87 06:38:14 EDT
References: <1376@imagen.UUCP> <116@faccs.UUCP> <3725@cit-vax.Caltech.Edu>
Reply-To: alan@pdn.UUCP (0000-Alan Lovejoy)
Organization: Paradyne Corporation, Largo, Florida
Lines: 29

In article <3725@cit-vax.Caltech.Edu> sho@tybalt.caltech.edu.UUCP (Sho Kuwamoto) writes:
>In article <116@faccs.UUCP> dbt@faccs.UUCP (Data base translator ) writes:
>Does anyone know what Apple plans to do with the 030, if anything?  I
>imagine third party 030 cards will become available for the MacII and
>maybe the SE, but they may not utilize the full instruction set.

The '030 differs from the '020 as follows:

  1) It has a 256 byte data cache.
  2) It has a SUBSET of the 68851 MMU on-chip.
  3) It can do burst-mode memory transfers.
  4) It can make more efficient use of static colum ram.
  5) It takes only one clock cycle to access the instruction and/or
     data caches (instead of 2).
  6) It takes only 2 clock cycles to access ram (instead of 3).
  7) It has two 32-bit buses, internally and externally, one for 
     addresses and one for data, that operate in parallel ("Harvard
     Architecture").

Note that only #2 makes any difference to software, and that Apple is
going in the direction of making the 68851 standard equipment anyway.
There is almost nothing that needs to be done to '020 software in order
to take full advantage of the '030.  This is Motorola's most compatible
CPU yet.

Alan "If President Reagan is telling the truth, why do they have to
      keep cutting off part of his nose?" Lovejoy