------Joe Theismann's Pro Football-----
A 4am crack                  2023-09-17
---------------------------------------

Name: Joe Theismann's Pro Football
Genre: sports
Year: 1985
Credits: Fasco
Publisher: Avant-Garde Publishing
Platform: Apple ][+ or later (64K)
Media: 5.25-inch disk
Sides: 2
OS: custom

This disk was automatically cracked by
Passport. It applied no patches during
deprotection, but the original disk was
heavily protected by a custom RWTS that
allows for both $D4 and $D5 as the
first address field prologue nibble,
as well as either a standard $DE or a
nibble with a timing bit as the
epilogue, as shown here:

                 --v--

T00,S05
----------- DISASSEMBLY MODE ----------
0037:A0 FC          LDY   #$FC
0039:84 26          STY   $26
003B:C8             INY
003C:D0 04          BNE   $0042
003E:E6 26          INC   $26
0040:F0 51          BEQ   $0093
0042:BD 8C C0       LDA   $C08C,X
0045:10 FB          BPL   $0042
0047:4A             LSR             <--
0048:C9 6A          CMP   #$6A      <--
004A:D0 EF          BNE   $003B
004C:BD 8C C0       LDA   $C08C,X
004F:10 FB          BPL   $004C
0051:C5 31          CMP   $31
0053:D0 F2          BNE   $0047
0055:A0 03          LDY   #$03
0057:BD 8C C0       LDA   $C08C,X
005A:10 FB          BPL   $0057
005C:C9 96          CMP   #$96
005E:D0 E7          BNE   $0047

...

007E:BD 8C C0       LDA   $C08C,X
0081:10 FB          BPL   $007E
0083:C9 DE          CMP   #$DE
0085:F0 0A          BEQ   $0091
0087:48             PHA
0088:68             PLA
0089:BD 8C C0       LDA   $C08C,X   <--
008C:C9 08          CMP   #$08      <--
008E:B0 03          BCS   $0093
0090:EA             NOP
0091:18             CLC
0092:60             RTS
0093:38             SEC
0094:60             RTS

                 --^--

More information and source code is
available at
https://archive.org/details/Passport4am

Side B is unprotected.

Quod erat liberandum.

---------------------------------------
A 4am crack                    No. 3176
------------------EOF------------------