Button activators ("Jokers") for systems with no 'If, Then' code type?

[Lazy Bastard]

Interesting results. It's definitely a good start, on the path to putting together a hacking guide.

[rimsky82]

Retro Joker Guide

Here's a guide I just wrote, using Contra for the NES and making the select button a weapon switcher for player 1.

It's a .docx file.

[Abystus]

So what's the method everyone is using to find the address receiving the input from the controller? I've always just watched the hex editor for activity when the buttons were pressed/held. It's always nice to have a few different methods so I'd love to hear everyone's preferred methods.

[lee4]

I find interesting that Genesis and PC Engine the extra buttons already has a value flag.

Street Fighter 2 CE on PCEngine emulator

0C74
00=no buttons
01=I
02=II
04=select
08=run
10=up
20=right
40=down
80=left

0C77
50=no buttons
51=III
52=IV
54=V
58=VI

I just scan for differences, greater than and less than or just compare the two dumps for changes.

[Lazy Bastard]

rimsky82: I finally got around to adding your guide to the Library, in PDF form for greater compatibility. Nice doc, by the way.

I'll try to do some legwork one of these days in compiling a list of games and systems, and their values for each button press and combination.