Add native cheat support - Githubissues

libretro / beetle-pce-fast-libretro

Standalone fork of Mednafen PCE Fast to libretro

GNU General Public License v2.0

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Add native cheat support #169

Closed negativeExponent closed 3 years ago

negativeExponent commented 3 years ago

Supports cheats in the form of F82xxx-F83xxx (physical address. RAM)
Cheats in 1F0xxx-1F1xxx (raw address, RAM)
Cheats in 00D000-100000 (raw address, System Card Ram)
Cheats in 100000-110000 (raw address, CD RAM)
Cheats in 802000-802000 (physical address, CD RAM)
Cheats in F82000-F83000 (physical address, main RAM)
as well as multi-line cheats.

Notes:

Cheats has to be a 9-digit format, address in 6-digit followed by ':' separator and then a 1-byte value, aka xxxxxx:yy
Multiline cheats has to be represented as xxxxxx:yy+xxxxxx:yy with '+' as a code separator
It is best to use raw format (or mednafen code formats) within the range expected above.
ROM based cheats not implemented (most of the labeled raw address) as they require writing to read-only memory.

Reference: libretro/beetle-pce-fast-libretro#93