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Path: utzoo!mnetor!uunet!husc6!bu-cs!acm
From: acm@bu-cs.BU.EDU (ACM)
Newsgroups: comp.sys.ibm.pc
Subject: Re: watch out for install program in LIm EMM 4.0
Message-ID: <16147@bu-cs.BU.EDU>
Date: Wed, 18-Nov-87 11:50:53 EST
Article-I.D.: bu-cs.16147
Posted: Wed Nov 18 11:50:53 1987
Date-Received: Sat, 21-Nov-87 04:49:47 EST
References: <327@ndcheg.UUCP> <2174@encore.UUCP>
Reply-To: madd@bucsb.bu.edu
Followup-To: madd@bucsb.bu.edu
Organization: Boston University ACM
Lines: 35
Keywords: LIM, EMS, install, intel

In article <2174@encore.UUCP> schwalbe@encore.UUCP (Jim Schwalbe) writes:
>Be forewarned, DO NOT do anything which writes to the hard drive when you
>are in turbo mode on your PC clone.

Woah!  This is *not* the case for most clones!  While this may be the
case for many clones, I wouldn't go tell all clone owners "don't use
your hard drive while in turbo mode."  Of all of them I've used, none
had trouble with the hard drive.

Many clones *do* have problems with the floppy drive while in turbo
mode, however.  There are some subtle timing problems that
occasionally cause the PC to lock up and you have to do a physical
on/off to reset it.  The clone that used to be put out by PC Network
is a prime example of a clone that exhibits this trait.

[description of his problem follows -- apparently a doubly written
byte]

>Curiously, I went back and looked in the manual that came with my clone
>and sure enough, they state that programs like diskcopy, copyiipc, and a
>few others won't work properly in turbo mode.  My bet is that the timing
>to the disk controller doesn't make worst case at 8 MHz so spurious errors
>can occur.  Have any other clone users seen this problem in turbo mode?
>I'll bet it's a generic problem although it could be the type of hard disk
>controller we're using (mine is a Microtek).

Wow.  Which clone do you have?  I've never seen one that actually
documents problems with the hard drive in turbo mode and I would like
to know more about it; what type of controller, PC, drive (you say
Microtek but which?) etc.

Thanx for any info.

jim frost
madd@bucsb.bu.edu