RA with Snes9x does not map anything for READ_MEMORY and WRITE_MEMORY, so fallback to READ_RAM and WRITE_RAM if possible
RA with bsnes-mercury core maps ROM, but LoROM is broken: reading $018000 actually returns $010000 instead of $008000, so half of ROM is inaccessible. ExLoROM and ExHiROM is untested
RA with bsnes-mercury core does not allow writing to ROM, so set that feature flag through hasRomWriteAccess()
better debug messages when address translation fails
READ_MEMORY
andWRITE_MEMORY
, so fallback toREAD_RAM
andWRITE_RAM
if possible$018000
actually returns$010000
instead of$008000
, so half of ROM is inaccessible. ExLoROM and ExHiROM is untestedhasRomWriteAccess()