Unprotect for Grand Prix   by Independent (IND)

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 -------------------------------------------------------------------------- Unprotect Brought to you courtesy of Super Dave Super Dave can be reached at: The Download Depot BBS (803) 269-7899 Greenville, SC