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From: daveh@cbmvax.commodore.com (Dave Haynie)
Newsgroups: comp.sys.amiga.hardware
Subject: Re: LUCAS with 68030 in A2000
Keywords: LUCAS, 68030
Message-ID: <14421@cbmvax.commodore.com>
Date: 13 Sep 90 20:44:05 GMT
References: <1053@duteca.UUCP>
Reply-To: daveh@cbmvax.commodore.com (Dave Haynie)
Organization: Commodore, West Chester, PA
Lines: 22

In article <1053@duteca.UUCP> eddy@duteca.tudelft.nl (J.G.E. Olk) writes:

>I'm planning to build the LUCAS board (own PCB) with a 68030 and use it in my
>A2000 (Rev. 4.4):

>    Is it possible to simply replace the 68020 by a 68030 (except for the
>    different pinout), or do I need to change PAL equations?

Basically, the 68030 supports all the 68020 features, and then some.  To 
hook a 68030 into a 68020 bus, you need to eliminate the extra 68030 features.
Basically, hooking 1K pullup resistors to the 68030's STERM*, CIIN*, and 
MMUDIS* inputs will do this for you, if I remember correctly.  You won't be
able to use the data cache without building an MMU setup that inhibits the
cache for any memory that doesn't provide full port data on reads.

> Eddy Olk                         Delft University of Technology 


-- 
Dave Haynie Commodore-Amiga (Amiga 3000) "The Crew That Never Rests"
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      Get that coffee outta my face, put a Margarita in its place!