Unprotect for Grand Prix by Independent (IND)
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Last modified Dec 11, 1988 9:44:18 AM
MD5 checksum 0f972cd339f9020363ff776c67485506
Mime type ASCII text, with CRLF line terminators
Download GP-UNP.TXT
Size 1 kB
1988 December 11
- Text / Guides and how-tos
- Super Dave, writer credits
Unprotect for Grand Prix (IBM PC)
BE SURE TO BACKUP YOUR GRAND PRIX DISK BEFORE STARTING AND USE THE
BACK UP FOR THE UNPROTECT.
Modify only the backup copy!!!
First you should rename the file or files
GPCGA.EXE TO GPCGA
GPTDY.EXE TO GPTDY
GPEGA.EXE TO GPEGA
Ex. C>rename gpcga.exe gpcga
Next Load program into debug...
Ex. C>debug gpcga
Then Follow the sample debug session:
-s 0000 ffff b4 30 cd 21 3c : Search of protection pattern
XXXX:YYYY : The search will return two addresses.
XXXX:YYYY If more or less than two are returned
this unprotect may not work.
ZZZZ=YYYY+0007 : Add 7 to the second address found
: (These numbers are in hex. If you are
unfamiliar with the adding of hex
numbers don't attempt this patch)
-e ZZZZ e9 4b 01 90 90 : Edit the contents of the computed
address
Now write the new gpcga game back to the disk:
-w <Enter>
Writing XXXX bytes
Then Quit Debug:
-q <Enter>
Now it is time to rename gpcga back to gpcga.exe
C>ren gpcga gpcga.exe
Now try to run the new (Hopefully) unprotected version of Grand Prix
C>gpcga
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Unprotect Brought to you courtesy of Super Dave
Super Dave can be reached at:
The Download Depot BBS
(803) 269-7899
Greenville, SC