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Path: utzoo!watmath!csc
From: csc@watmath.UUCP (Jan Gray)
Newsgroups: net.micro.cbm
Subject: Re: Amiga - 68000 chip
Message-ID: <16273@watmath.UUCP>
Date: Sun, 25-Aug-85 22:10:08 EDT
Article-I.D.: watmath.16273
Posted: Sun Aug 25 22:10:08 1985
Date-Received: Tue, 27-Aug-85 00:44:41 EDT
References: <3429@garfield.UUCP>
Reply-To: csc@watmath.UUCP (Jan Gray)
Distribution: net
Organization: U of Waterloo, Ontario
Lines: 25
Summary: 

In article <3429@garfield.UUCP> michael3@garfield.UUCP (Mike Rendell) writes:
>[]
>
>  I am wondering why the Amiga uses the 68000 chip instead of the 68010?
>The 68010 has been out for quiet a while (about a year?) so it was around
>when the Amiga was being devoloped.  Also, would it be possible to upgrade
>it to the 68010 (or maybe the 68020)?
>
>
>					Mike Rendell
>					michael3@garfield

Unless you need the ability to complete a page-faulted instruction
you don't need a 68010.  The 68010 also gets you "loop mode" (although
I seem to remember unrolled loops are faster), a movable interrupt vector
base, and a few other things, but 68010s are probably a bit more expensive
than 68000s.

The 68010 is pin compatible with the 68000.

The 68020 on the other hand would be quite an improvement, but I doubt
it would sync well with the Amiga interleave-DMA-with-instruction scheme,
and it is of course not pin compatible.

Jan Gray