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Various Unprotection Examples
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HELI-UNP
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HELIUNP.DOC
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1987-10-14
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3KB
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133 lines
UNPROTECT
Sierra's 3-D
H E L I C O P T E R
Simulation
By Tony Elliott
CIS ID: 71370,2676
As always, I am going to begin this document by stating that
this information is for the exclusive use of individuals who own
legitimate copies of Helicopter Simulator. I do not condone
software piracy in any form! I do not, however, agree with soft-
ware authors/distributors who choose to make their product diffi-
cult to use by adding "copy protection." This effects all of us
adversely, especially hard disk users.
This document, along with the file "CODE.OVL" will enable you
to load Helicopter Simulator without having to place the original
"key" disk in drive A:.
PLEASE NOTE: The unprotects available for Kings Quest III and
Space Quest WILL NOT work with loader program supplied with Heli-
copter Simulator. Although the ID of both loaders indicate Ver-
sion 3, the ones used with KQ & SQ are some 500 bytes smaller.
Now, on with the procedure...
First be sure that you are working from a backup copy of your
original distribution diskette, or hard disk users may use the
sub-directory created when the program was installed.
Also, be sure that a copy of debug is in the current directory
occupied by Helicopter Simulator or is somewhere in the PATH.
Copy the file CODE.OVL (supplied with the document) to Heli-
copter's sub-directory or floppy disk.
Follow the directions below exactly.
DEBUG HELI.COM <enter>
R <enter> Write down the value of CX Register.
I got a value of AF6
N CODE.OVL <enter>
L 141 <enter>
D 0363 <enter> Make sure that the six bytes starting
at 0363 are E8 17 06 E8 9A 00
If not, STOP NOW! This patch probably
will not work!
E 0363 90 90 90 90 90 90 <enter> Disable the copy protection
N HELI.COM <enter>
R CX <enter>
: xxx <enter> Enter the value recorded above for the
CX Register. Put it in place of the xxx
W <enter>
Q <enter>
That's it! If you followed the above instructions exactly and
all of the proper values checked were verified, then you should
have an unprotected copy of Helicopter Simulator!
If you have any question or problems with this patch I may be
reached on Compuserve, T.J.'s BBS in Atlanta at (404) 394-1756, or
after November 1, 1987, on Programmer's Information Exchange, also
in Atlanta at (404) 928-0033. Both are PC Pursuitable.
ENJOY!!