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Forums > CSDb Entries > Release id #198402 : Ditch and Bridge +
2020-12-25 05:21
Six

Registered: Apr 2002
Posts: 254
Release id #198402 : Ditch and Bridge +

I just wanted to discuss the obfuscation on the original on this one. You can find a TAP of it at ftp://8bitfiles.net/gamebase_64/Games/d1/DITCHBRI_23846_01.zip

I know this sort of thing is of great interest to some of us so I thought I should mention it.

It starts at $0838. I've included a small snippet to illustrate what I'm talking about.

.C:0838  DC 78 0A    NOOP $0A78,X
.C:083b  08          PHP
.C:083c  34 E2       NOOP $E2,X
.C:083e  D4 8B       NOOP $8B,X
.C:0840  34 FC       NOOP $FC,X
.C:0842  D4 8C       NOOP $8C,X
.C:0844  18          CLC
.C:0845  FA          NOOP
.C:0846  74 01       NOOP $01,X
.C:0848  90 06       BCC $0850
.C:084a  C5 6A       CMP $6A
.C:084c  D3 02       DCP ($02),Y
.C:084e  F6 07       INC $07,X
.C:0850  5C C4 EB    NOOP $EBC4,X
.C:0853  E7 08       ISB $08
.C:0855  FA          NOOP
.C:0856  34 62       NOOP $62,X
.C:0858  0D 3D B0    ORA $B03D
.C:085b  64 CB       NOOP $CB
.C:085d  CF 2C F6    DCP $F62C


I was wondering if if there was ever a tool for doing this, or if this is something the coder always did by hand. I remember experimenting with this sort of thing back in the 80s because many monitors at the time couldn't handle the undocs, but this is so much it feels like it had to be done with a tool.


An interesting last side-note, the obfuscation chokes exomizer - doesn't stop it, but brings it to a crawl - presumably because it creates so many tiny unique blocks?
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