Category : Unprotects for Games and Such
Archive   : ALLECAT.ZIP
Filename : ALLECAT.UNP

Output of file : ALLECAT.UNP contained in archive : ALLECAT.ZIP

First, make a copy of the master disk using DOS DISKCOPY program.
Put the original away in a safe place.

Load DEBUG from your DOS diskette (A>DEBUG)
Put the copy of the ALLEY CAT disk in drive A:
From the DEBUG prompt (-), type the following:
(a) -L 0 0 2F 1 {loads Track 5, Sector 8, Side 0 from
Drive A:}

(b) -D 158 15A {display some code}
You should see something like:

2488:0158 23 11 FE

If this part matches between this and your disk, you're in luck.

(c) -E 158 BB 20 {change an encrypted JAE 3F68 to an
encrypted JMP 3F7A - tells the pgm to not
bother checking for the signature}

(d) -E 17A 90 90 {NOP out another error check}

(e) -W 0 0 2F 1 {save the change}

(f) -Q {exit DEBUG}

Your disk is now unprotected. Enjoy!

Jeff Johnson 2/28/87

A technical note - like SHAMUS, this game uses an encryption scheme to
mix up some of the code to make it hard to break. Unlike SHAMUS, however,
only every 4th byte of code is encrypted - strange, but true. See SHAMUS.UNP
for all the gory details on how to encrypt the necessary changes.

  3 Responses to “Category : Unprotects for Games and Such
Archive   : ALLECAT.ZIP
Filename : ALLECAT.UNP

  1. Very nice! Thank you for this wonderful archive. I wonder why I found it only now. Long live the BBS file archives!

  2. This is so awesome! 😀 I’d be cool if you could download an entire archive of this at once, though.

  3. But one thing that puzzles me is the “mtswslnkmcjklsdlsbdmMICROSOFT” string. There is an article about it here. It is definitely worth a read: