Function rom_writebyte

src/lua-engine.cpp:1534–1542

doesn't keep backups to allow maximum speed (for automatic rom corruptors and stuff) keeping them might be an option though, just need to use memview's ApplyPatch() that'd also highlight the edits in hex editor

// keeping them might be an option though, just need to use memview's ApplyPatch()
// that'd also highlight the edits in hex editor
static int rom_writebyte(lua_State *L)
{
	uint32 address = luaL_checkinteger(L,1);
	if (address < 16)
		luaL_error(L,"rom.writebyte() can't edit the ROM header.");
	else
		FCEU_WriteRomByte(address, luaL_checkinteger(L,2));
	return 1;
}

static int memory_readbyte(lua_State *L) {
	lua_pushinteger(L, GetMem(luaL_checkinteger(L,1)));