Path: utzoo!mnetor!uunet!husc6!uwvax!puff!avery
From: avery@puff.cs.wisc.edu (Aaron Avery)
Newsgroups: comp.sys.amiga
Subject: Re: 68030-based PC's
Message-ID: <1505@puff.cs.wisc.edu>
Date: 25 Mar 88 05:28:27 GMT
References: <8608@g.ms.uky.edu> <3512@cbmvax.UUCP>
Distribution: na
Organization: U of Wisconsin CS Dept
Lines: 22

In article <3512@cbmvax.UUCP>, daveh@cbmvax.UUCP (Dave Haynie) writes:
> The current '030s are in 16.67Mhz and 20Mhz versions.  I think Moto has
> announced 25Mhz planned before the end of the year, and I for one would
> certainly like to see a 30Mhz version some day.
You got this right. However, Motorola themselves have 68030's running at
30Mhz (and 68882's!) NOW. I've seen one. They're making a VMEmodule which
is a 'Monoboard Microcomputer' with 25 and 30Mhz clocks. Probably one of
the best size/performance ratios to date.

> On the other hand, for the same speed clock, the 68030 can run memory cycles
> over twice the speed of the 68020/68851 combination....
Over twice? This must be only in cases of 0ns internal MMU translation. The
'030 can have a 2-clock memory cycle, while the '020 is limited to a 3-clock
memory cycle, so there's this advantage up front. The other big advantage
is the added internal data cache in the '030. Then there's the internal
pipelining, to allow instruction fetch, address translation, effective address
calculation, and arithmetic operation all functioning simultaneously (hope
I didn't stretch it one too far, but you get the point). Basically, this is
one FINE processor, and I hope to be playing with one in the near future.

Aaron Avery (avery@puff.cs.wisc.edu)
	    ({seismo,caip,allegra,harvard,ihnp4}!uwvax!puff!avery)