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From: vjja@houxm.UUCP
Newsgroups: net.micro.pc
Subject: DISKCOPY fix
Message-ID: <678@houxm.UUCP>
Date: Tue, 17-Jan-84 14:48:33 EST
Article-I.D.: houxm.678
Posted: Tue Jan 17 14:48:33 1984
Date-Received: Wed, 18-Jan-84 07:27:38 EST
Organization: Bell Labs, Holmdel NJ
Lines: 58

From User Updates - June 1983 - IBM Personal Computers

"Future User Updates will be available at your Authorized IBM
Personal Computer Dealer."

Software Tips:

"Correcting erroneously reported read/write errors resulting from
DISKCOMP and DISKCOPY commands in DOS 1.1 and DOS 2.0

In DOS 1.1 and 2.0, the DISKCOMP and DISKCOPY commands may
erroneously report diskette read and/or write errors on tracks 40
and over.  This may occur on memory systems that are large enough to
store the entire contents of a double-sided diskette.  To correct this,
use the following DEBUG patches:

For DISKCOPY, type:

A>DEBUG DISKCOPY.COM
-E861 E8 74 00
-E8D8 3D 51 00 72 02 B0 50 A2 36 05 C3
-RCX

When the DEBUG utility displays:

CX 07D8

type:

:7E3
-W
-Q

For DISKCOMP, type:

A>DEBUG DISKCOMP.COM
-E6EC E8 79 00
-E768 3D 51 00 72 02 B0 50 A2 95 04 C3
-RCX

When the DEBUG utility displays:

CX 0668

type:

:673
-W
-Q"

[ Of course never do this to your original copy of DISKCOPY and DISKCOMP,
ed. ]

This particular issue of User Updates also included fixes for Multiplan
(how to install Multiplan with DOS 2.0) and PASCAL (to fix a bug that
caused false "out of memory" errors on IBM PCs with large memory).

Jim Allen (...!ihnp4!houxm!vjja)