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LOTUS.UNP
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1984-01-16
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2KB
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46 lines
UNPROTECT LOTUS 1-2-3
There is a simple way of unprotecting 1-2-3 so that all the files may
reside on your hard disk or to enable backup copies to be made. there is
only one file really protected:1-2-3.EXE. 1-2-3.EXE checks the timing of
sectors 19 and 20 to see that it takes .1 seconds longer than 21 and 22
and that 38 and 39 take .1 seconds longer than 40 and 41.
To unprotect 1-2-3, just make a copy of the Master disk using DISKCOPY
(ignore the errors). Place your copied disk in Drive B and Rename
123.EXE to 123.XYZ. Now you must use DEBUG on 123.XYZ.
DEBUG B:123.XYZ
S DS:100 FFFF E8 BE 71 (This to find the call to the timing checker.)
04FA:3666 (The location where it is at.)
E 3666 90 90 90 (NOP it out.)
W (Write patches)
Q (Exit DEBUG)
Now Rename the patched version of 123.XYZ back to 123.EXE:
RENAME B:123.XYZ 123.EXE
UNPROTECT THE NEWEST VERSION OF 1-2-3
The above patch is for the original version of 123.EXE.
Version 1A of Lotus 1-2-3 can be unprotected with the following patch
(it uses a different technique).
1. Rename 123.EXE to 123.XYZ
2. DEBUG 123.XYZ
3. Type U ABA9
4. You should see INT 13 at that address
5. Type E ABA9 90 90
6. Type W
7. Type Q
8. Rename 123.XYZ back to 123.EXE
That's it. Good luck and please remember this information is for your
benefit only and not to be used for pirating Lotus 1-2-3.
SOURCE: HAL-PC Newsletter, Aug. 1983
TOPCC Newsletter September 1983