How to Unprotect Chessmaster Version 1.03 by Independent (IND)
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Last modified Mar 25, 1987 10:11:54 PM
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Download CMASTER.UNP
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1987 March 25
- Text / Guides and how-tos
- Greg Menounos, writer credits
How to Unprotect Chessmaster Version 1.03
by Greg Menounos
January 26,1987
Chessmaster 2000 is an excellent program with almost all the
features you could possibly want rolled into one package. Its only flaw
is that it is copy-protected. It is not an auto-booting disk, however,
and with a simple patch can be backed-up and/or placed on a hard disk.
1. Copy all the files to a formatted diskette or a hard drive. Do not
bother copying the hidden file "priority.sw". This file is located on
track 39 and is where the copy-protected sectors live. Put your master
diskette in a safe place; you probably won't need it again.
2. Type "rename cm.exe cm<ENTER>"
3. Type "debug cm<ENTER>"
4. Type "u 741<ENTER>" You should see the following:
XXXX:0741 50 PUSH AX
XXXX:0742 E8D744 CALL 4C1C
XXXX:0745 83C402 ADD SP,+02
XXXX:0748 0BC0 OR AX,AX
XXXX:074A 7407 JZ 0753
5. Type "a 741<ENTER>"
6. Type "jmp 74c<ENTER><ENTER>"
7. Type "w<ENTER>" and then "q<ENTER>"
8. Type "rename cm cm.exe<ENTER>"
9. That's it. Enjoy.