Cheat Devices - ActionReplay/GameShark Code Format

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Here are my current findings about Datel's ActionReplay / GameShark PSX Cheat Code format:

Code: Select all

PSX Gameshark Code Format
  30xxxxxx 00dd   ;-8bit Write  [aaaaaa]=dd
  80aaaaaa dddd   ;-16bit Write [aaaaaa]=dddd
Below for v2.2 and up only
  D0aaaaaa dddd   ;-16bit/Equal     If dddd=[aaaaaa] then (exec next code)
  D1aaaaaa dddd   ;-16bit/NotEqual  If dddd<>[aaaaaa] then (exec next code)
  D2aaaaaa dddd   ;-16bit/Less      If dddd<[aaaaaa]<dddd? then (exec next code)
  D3aaaaaa dddd   ;-16bit/Greater   If dddd>[aaaaaa]>dddd? then (exec next code)
  E0aaaaaa 00dd   ;-8bit/Equal      If dd=[aaaaaa] then (exec next code)
  E1aaaaaa 00dd   ;-8bit/NotEqual   If dd<>[aaaaaa] then (exec next code)
  E2aaaaaa 00dd   ;-8bit/Less       If dd<[aaaaaa]<dd? then (exec next code)
  E3aaaaaa 00dd   ;-8bit/Greater    If dd>[aaaaaa]>dd? then (exec next code)
  10aaaaaa dddd   ;-16bit Increment [aaaaaa]=[aaaaaa]+dddd
  11aaaaaa dddd   ;-16bit Decrement [aaaaaa]=[aaaaaa]-dddd
  20aaaaaa 00dd   ;-8bit Increment  [aaaaaa]=[aaaaaa]+dd
  21aaaaaa 00dd   ;-8bit Decrement  [aaaaaa]=[aaaaaa]-dd
Below for v2.41 and up only
  D4000000 dddd   ;-Buttons/If  If dddd=JoypadButtons then (exec next code)
  D5000000 dddd   ;-Buttons/On  If dddd=JoypadButtons then (turn on all codes)
  D6000000 dddd   ;-Buttons/Off If dddd=JoypadButtons then (turn off all codes)
  C0aaaaaa dddd   ;-If/On       If dddd=[aaaaaa] (turn on all codes)
Below probably v2.41, too (though other doc claims for v2.2)
  5000nnbb dddd   ;\Slide Code aka Patch Code aka Serial Repeater
  aaaaaaaa ??ee   ;/for i=0 to nn-1, [aaaaaaaa+(i*bb)]=dddd+(i*??ee), next i
  00000000 0000   ;-Dummy (do nothing?) needed between slides (CD version only)
Below probably v2.41, too (though other doc claims for ALL versions)
  C1000000 nnnn   ;-Delays activation of codes by nnnn (4000-5000 = 20-30 sec)
  C2ssssss nnnn   ;\Copy ssss bytes from 80ssssss to 80tttttt
  80tttttt 0000   ;/

And, there seem to be additonal "Caetla .341" codes: http://www.psxdev.net/forum/viewtopic.php?f=60&t=496

Notes
A maximum of 30 increment/decrement codes can be used at a time.
A maximum of 60 conditionals can be used at a time (this includes Cx codes).
Increment/decrement codes should (must?) be used with conditionals.
Unknown if greater/less conditionals are signed or unsigned.
Unclear if greater/less compare dddd by [aaaaaa], or vice-versa.
Unknown if 16bit codes do require memory alignment.

Links
http://gamehacking.org/faqs/hackv500c.html - cheat code formats
http://doc.kodewerx.org/hacking_psx.html - cheat code formats
http://gamehacking.org/wiki/Code_Types_(Playstation) - cheat code formats

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Anybody who could help on solving some of the various questions marks and other unclear details?