Date   : Sun, 18 Nov 1990 04:47:57 GMT
From   : dog.ee.lbl.gov!hellgate.utah.edu!fcom.cc.utah.edu!cc.utah.edu!cc.usu.edu!slsw2@ucsd.edu
Subject: V20 chips in DEC Rainbow computers

In article <453@organpipe.UUCP>, tom@astro.as.arizona.edu (Thomas J. Trebisky)
writes:
> First, is there a newsgroup more appropriate than this for questions
> about the Rainbow?

Try comp.sys.dec.micro.

> Second, does anyone have experiences, pro or con, about replacing the 8088
> with the more efficient V20 processor.
> I have heard a variety of groundless apprehensions, but I am hoping someone
> will respond with something like, "yes, I have run one for years and it works
> great."

This is actually a rather popular thing to do to a Rainbow. I just put one in
mine a couple of days ago (sorry, I can't claim years), but lots of people
have done it.

The only caveat is that when you do it your Rainbow will no longer pass its
power-on diagnostics. However, I came across this on comp.sys.dec.micro the
other day (I've not tried it yet, so I can't say what it is or if it works):


>> Date:     10-23-90 (10:26)
>> To:       ALL
>> Subject:  V20 EPROM MODS
>> From:     FRANK MALLORY
>> 
>> Carl Houseman has uploaded his article describing how to modify your
>> boot ROM  to adapt it to the NEC V20 processor.  It's available
>> here as V20ARTIC.ZIP, in  file area 25.
>>  * Origin: Silver Bullet - Silver Spring, Md. - 301-622-2247 (1:109/417)

If you do look at this article, I'd be interesting in knowing what it says
(301's a long-distance call from 801).
-- 
==============================================================================
Roger Ivie

35 S 300 W
Logan, Ut.  84321
(801) 752-8633
==============================================================================


End of INFO-CPM Digest V90 Issue #186
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