Unprotect Sierra On-Line's 3D Helicopter by Independent (IND)
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Last modified Jun 21, 2015 8:43:16 PM
MD5 checksum 52ff8a7443c72f7f6764bfd787f0dbd7
Mime type Zip archive data
Download HELI.zip
Size 2 kB
1987 October 21
- Text / Guides and how-tos
4 items in the archive
- CODE.OVL
- HELI.DAT
- HELI.DOC
- HELIUNP.DOC
This procedure will enable you to unprotect Sierra On-Line's 3D
HELICOPTER game. The procedure is based on an unprotect
procedure for KING'S QUEST III, by an unknown author.
There are two files included in this ARC package:
1. HELI.DOC - This file
2. HELI.DAT - Supplementary file needed during DEBUG session.
The procedure is relatively simple:
1) Put a blank, formatted diskette in drive B, and the HELICOPTER Disk
#1 in drive A, then at the A> prompt, COPY *.* B:. Then put Disk #1
away - you won't need it anymore!
2) Load DEBUG, making sure both HELI.COM (on the backup disk) and
HELI.DAT (from this package) are both in the current path or on the
default drive.
3) Use DEBUG to patch HELI.COM.
-N HELI.COM
-L
-R (Record value of CX register)
-N HELI.DAT
-L 141
-E 366
XXXX:0366 E8.90 7D.90 03.90
-N HELI.COM
-R CX
CX 0080
:???? (Enter value of CX you recorded)
-W
-Q
4) That's all there is to it. HELICOPTER is now unprotected.