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From: jax@well.sf.ca.us (Jack J. Woehr)
Newsgroups: alt.sources.amiga,comp.sys.amiga,comp.sys.amiga.tech
Subject: Re: replacing the 68000 by a 68070 - is it possible
Keywords: 68070 68010 processor replacement
Message-ID: <19508@well.sf.ca.us>
Date: 12 Aug 90 03:58:16 GMT
References: <453@krabat.marco.UUCP>
Lines: 26

helmut@marco.UUCP (Helmut Raiger) writes:

>Hi,
>does anybody know wether the Amiga 500 runs with the 68000 replaced by
>an 68070 (I know, that the 68070 does not have an synchronous bus interface - 
>E, VPA and VMA missing). Can the Amiga firmware support this chip? The short
>exception format is like the one of the 68010, but the long one is different.

	Helmut ...

	It *might* be possible to develop a drop-in board for the 68070,
(though why one would do it, i don't know).

	The 68070 from Philps/Signetics is *not* the 68040 + 30. It is
a 68010 mask with added functionality (DMA, I^2C bus, MMU) for use
as an embedded controller. While it offers a higher clock speed than
the 68010, its cycle-efficiency is lower by apporimately one cycle per
operation due to the MMU.

	My experience with this chip was in designing a single board computer
for embedded control (never commerically produced).

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