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From: cramer@kontron.UUCP (Clayton Cramer)
Newsgroups: net.micro.pc
Subject: Re: NEC V20 How to How to USE?
Message-ID: <1091@kontron.UUCP>
Date: Sun, 28-Sep-86 16:37:48 EDT
Article-I.D.: kontron.1091
Posted: Sun Sep 28 16:37:48 1986
Date-Received: Tue, 30-Sep-86 19:47:52 EDT
References: <1500065@iuvax> <6200047@inmet>
Organization: Kontron Electronics, Mt. View, CA
Lines: 18

> 
> When I installed a V20 in my PC, I found that DISKCOPY and FORMAT
> didn't work any more.  Since it was an 8Mhz chip, I had increased
> the clock speed at the same time and perhaps that was the cause of
> the problem.  In the end, the performance improvement was so
> negligible (5 or 10% with the standard clock speed) that I decided
> to put the 8088 back and buy a "PC Elevator" which is a card with
> an 80286 on it.  The V20 with an 8Mhz clock is definitely the most
> bang (50% speedup) for the buck (about $25 including crystal).  It
> just bugs me when basic utilities don't work.
> 
> 		-- Mike Gordon	(ihnp4!inmet!gordon)

DISKCOPY and FORMAT both require that the processor run at 4.77 MHz.
(Timing dependencies involving the disk controller.)  The FAST88 kit
I have gives you a switch to go back to 4.77 MHz for this exact reason.

Clayton E. Cramer