SPACE QUEST II UNPROTECTED BY SINBAD ON 8-29-88.

THE FILE SIERRA.COM CONTAINED A LOAD AND EXECUTION OF A FILE CALLED CPC.COM
(COPY PROTECTION CHECK?) WHICH NOT ONLY CHECKED FOR THE REQUIRED BAD SECTORS
ON THE ORIGINAL DISK, BUT ALSO WROTE AN $80-BYTE 'MASK' FILE TO BE XOR'D WITH
YET ANOTHER FILE TO FORM A VECTOR TABLE.  THE MASK WAS WRITTEN TO 199B:0038
AND THE MASK WAS THEN MOVED TO DS:0141.  THIS WAS THEN XOR'D WITH $80 BYTES
AT 179A:0000 TO FORM THE TABLE.  BY NO-OPing LOCATIONS $3C1-$3C3, YOU AVOID
THE CALL WHICH WOULD ASK FOR THE DISKS, LOAD AND EXECUTE CPC.COM, AND MOVE
THE MASK.

THE PROCEDURE TO UNPROTECT THE DISK IS AS FOLLOWS:

        1.  FORMAT A REGULAR 360K DISK AND USE COPY *.* TO TRANSFER ALL
            FILES TO THE WORK DISK.

        2.  USING DEBUG, CALL UP THE FILE SIERRA.COM WHICH, IF YOU DUMP
            CS:100, WOULD BE VERSION 3.0 OF THE LOADER.
            i.e. DEBUG SIERRA.COM
                 D CS:100

        3.  MAKE A NOTE OF THE BX AND CX REGISTERS(SHOULD BE BX=0 AND
            CX=0C31) USING R<RET>.

        4.  NOW NO-OP THE LOCATIONS $3C1-$3C3 WITH THE EXAMINE COMMAND
            E CS:3C1 WHICH FIRST DISPLAYS THE VALUE AT LOCATION $3C1.
            CS:3C1 TO CS:3C3 CONTAIN E8 2E 04, WHICH IS A CALL TO $07F2.
            TYPE IN $90 AND HIT THE SPACE BAR TO ADVANCE TO THE NEXT
            LOCATION.  AFTER THREE NO-OPS, HIT RETURN.  THIS ELIMINATES
            THE CALL.

        5.  NEXT LOAD THE MASK DATA FILE CALLED SQ2.DAT AS FOLLOWS:

                N SQ2.DAT<RET>
                L 141<RET>

            THIS LOADS THE MASK DIRECTLY INTO THE AREA DS:141 (TO WHICH IT IS
            NORMALLY RELOCATED AFTER CPC.COM IS RUN).


        6.  NEXT RENAME THE FILE BACK TO SIERRA.COM, RESET THE CX REGISTER TO
            $0C31, AND WRITE TO DISK:

                N SIERRA.COM<RET>
                RCX<RET>
                (ENTER 0C31)<RET>
                W

THAT COMPLETES THE UNPROTECT. CPC.COM IS NOT NEEDED. IN DUMPING SOME OF THE
DATA AREAS, I NOTICED REFERENCE TO FOILA@CRYPTER WHICH I TAKE TO MEAN THIS
FORM OF ENCRYPTING THE TABLE DATA.