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MYMUNP.DOC
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1985-08-17
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MYMUNP - Usability aid for Andrew Tobia$ Managing Your Money
Copyright 1983 MECA. Version 1.35
MYMUNP allows the owner of a hard disk to run MYM in the system
environment as all properly written programs should. MYMUNP also
allows its owner to make backup copies of the MYM diskettes with
standard DOS commands. MYM is a fine program and it is not our intent
to help you to steal monies due the author of this software so please
do not sell copies whick contain MYMUNP.COM or the INT 75 patch.
The following procedure works on Version 1.35 of MYM:
Step 1. Copy MYMUNP.COM to the MYM subdirectory.
Step 2. Create MYM.BAT in the MYM subdirectory:
ECHO OFF
SET MODNAME=MYMUNP
MYMUNP
SET MODNAME=???
MYM75
Step 3. Do the following debug procedure to MYM.EXE which
changes the INT 13 to an INT 75.
REN MYM.EXE MYM
DEBUG MYM
-S 0 LFFFF CD 13
XXXX:44F0
-E 44F0 CD 75
-W
-Q
REN MYM MYM75.EXE
Step 4. Run MYM the way it should have been sold to you in the first
place.
How it works: The INT 75 instruction calls MYMUNP to (1) load the
buffer as if it had been read from the "hidden" sector on diskette,
(2) set return code 0 meaning the read was good, and (3) put the INT
13 back in case MYM does a checksum of itself to see if you have
modified the code. Once MYMUNP is installed as a DOS extension you
may leave and reenter MYM as often as you like without hunting for
master disk # 1.
Special thanks to the unknown author of SYMPHONY.UNP from which
we learned the interrupt 75 method.