Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!usc!ginosko!uunet!iconsys!caeco!jose!jim
From: jim@jose.uucp (Jim)
Newsgroups: comp.sys.ibm.pc
Subject: Re: 8 mhz "turbo" mode problem
Message-ID: <1989Sep13.150422.6926@jose.uucp>
Date: 13 Sep 89 15:04:22 GMT
References: <3578@blake.acs.washington.edu>
Organization: Price Savers, Salt Lake City, UT
Lines: 25

Dale Lear writes:
> 8 mhz "turbo" mode problem
> 
>      I'm having trouble with an XT clone when using it in 8mhz "turbo"
> mode.  While working away at 8mhz the keyboard shift status byte 
> (Ctrl/Shift/Num lock/Scroll lock) seems to get randomly set.  When 
> this happens I might type "abc" but the program I'm using will 
> think I've typed "^A^B^C", "ABC", or "alt-A alt-B alt-C".  I have 
> experienced this problem with a wide variety of programs but using a 
> Borland product seems to exacerbate the trouble.  This problem *never* 
> manifests itself when I run at 4.77mhz.
> 
> <stuff deleted>
> 
>      Just for the record; the mother board is a no-brand-name Taiwan 
> made job called a "TURBO-640", the CPU is an 8mhz rated NEC V20, the 
> ROM BIOS is a true blue IBM BIOS dated Monday, August 16, 1982, and 
> I'm using MSDOS 3.30.  Finally, CONFIG.SYS contains:

I had a 8 mhz turbo xt motherboard.  It came with a standard 8 mhz 8088,
and I bought the 8 mhz v20 for it.  It generally worked fine except for 
ocasional problems (similar to the ones you mention) and then the 
problems were only in turbo mode.  I removed the v20 and put the 8088 back
in, and the problems disappeared.