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cheat_simple: with game genie codes try 32k nes banks then fall back to 8k and warn with 6 char codes and banked prg

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cracyc 2020-09-08 18:51:03 -05:00
parent 6ebfb737a8
commit a03b22c555
1 changed files with 9 additions and 2 deletions
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11
plugins/cheat/cheat_simple.lua
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@ -92,13 +92,20 @@ function codefuncs.nes_gg(desc, code)
if #code == 6 then
addr = ((value >> 4) & 7) | ((value >> 8) & 0x78) | ((value >> 12) & 0x80) | ((value << 8) & 0x700) | ((value << 4) & 0x7800)
newval = ((value >> 20) & 7) | (value & 8) | ((value >> 12) & 0x70) | ((value >> 16) & 0x80)
if manager:machine():memory().regions[":nes_slot:cart:prg_rom"].size > 32768 then
emu.print_verbose("warning: gamegenie 6 char code with banked rom " .. desc)
end
return prepare_rom_cheat(desc, ":nes_slot:cart:prg_rom", addr, newval, 8)
elseif #code == 8 then
addr = ((value >> 12) & 7) | ((value >> 16) & 0x78) | ((value >> 20) & 0x80) | (value & 0x700) | ((value >> 4) & 0x7800)
newval = ((value >> 28) & 7) | (value & 8) | ((value >> 20) & 0x70) | ((value >> 24) & 0x80)
comp = ((value >> 4) & 7) | ((value >> 8) & 8) | ((value << 4) & 0x70) | (value & 0x80)
-- assume 8K banks, 32K also common but is an easy multiple of 8K
return prepare_rom_cheat(desc, ":nes_slot:cart:prg_rom", addr, newval, 8, 8192, comp)
-- try 32K banks then 8K
local status, cheat = pcall(prepare_rom_cheat, desc, ":nes_slot:cart:prg_rom", addr, newval, 8, 32768, comp)
if not status then
cheat = prepare_rom_cheat(desc, ":nes_slot:cart:prg_rom", addr, newval, 8, 8192, comp)
end
return cheat
else
error("error game genie cheat incorrect length " .. desc)
end