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SIERRA87.UNP
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Text File
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1988-07-11
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3KB
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62 lines
Please read the file READTHIS.1ST before proceeding to read this file.
Unprotect for all Sierra Games using the version 3.0 SIERRA.COM game
loader and the AGI (Adventure Game Interpreter). THE FOLLOWING PROCESS
APPLIES TO THE 1987 version of the 3.0 version SIERRA.COM game loader!
Make a copy of your original game disk 1 using the dos copy *.* command.
But don't put away your factory original game disk yet, you will need
it during the unprotect.
Arrange your configuration so that SIERRA.COM and DEBUG.EXE are on the
same disk, directory or path.
Using THE COPY of the game disk 1, start as follows:
DEBUG SIERRA.COM <return>
-r <return>
(Now a listing of all the registers will appear on the screen. Write down
the value of the BX and CX registers for later use)
-g 03C4 <return>
(The program will now run with a breakpoint set after the call to the
protection key data load. Follow the instructions on the screen, including
the prompt to insert your original disk (write protect it to be safe). The
key data from the specially formatted track will be loaded into memory.
When the program breaks back to debug (the registers will be listed again),
be sure you have the COPY you made of your original disk in the disk drive.)
-rbx <return>
BX XXXX
: <-type in here the value of BX register that
you were instructed to write down in step one.
<return>
-rcx <return>
CX XXXX
: <-type in here the value of CX register that
you were instructed to write down in step one.
<return>
-e 03C1 <return>
xxxx:03C1 E8.90 <space> 2E.90 <space> 04.90 <return>
(In the above line you have inserted NO-OP's (90's) to jump around the
protection check and opening screen calls)
-w <return> (this will write back to disk the unprotected
game loader)
Writing xxxx bytes
-q <return> (quits debug)
This completes the Sierra game 1987 version 3.0 game loader unprotect. Use
this unprotect to allow proper hard disk usage or to make an archival backup
copy. Please do not promote theft by using this procedure to distribute
unauthorized copies.
Bart Montgomery
Atlanta PCUG BBS
(404) 433-0062