
HOW TO PATCH 'CP/M-86 FOR THE IBM PC AND IBM PC XT, VERSION 1.1'
TO RUN ON ANY AT-CLASS MACHINE (286, 386, 486, Pentium, etc.)
(Patch developed by Richard Kanarek - November, 1995)

  1. Using a byte-level editor on the CPM.SYS file, locate the
     byte at absolute file offset 3DAFh.  The byte will be ABh.

  2. Change that byte to 47h.

  3. Now locate the byte at absolute file offset 3DB9h.  The byte
     will, again, be ABh.

  4. Change that byte to 47h.

  5. Save these changes to disk.

  6. Boot your machine from this patched version of CPM.SYS.
     The 'patched' version will also work fine with 8086, 8088
     and V20-based IBM-compatibles.

NOTE: This patch is specific to 'CP/M-86 For The IBM PC and IBM
PC XT, Version 1.1.'  It will NOT work with any other permutation
of CP/M-86.

'Patching' should always be done to a COPY of the CPM.SYS file, and
not to the file on the original system disks.

As is always the case with this kind of 'free' information, there
are NO guarantees whatsoever.  If you choose to use this information,
you do so entirely at your own risk and peril, and YOU assume all
responsibility for the result.

