iNES Mapper 246 seems to be a singleton for the Taiwanese game 封神榜 (Fēngshénbǎng: Fúmó Sān Tàizǐ).
It provides 2 KiB of RAM from $6800-$6FFF.
Mask: $FFE7 $6000-6003: PRG Regs $6004-6007: CHR Regs CHR Setup: --------------------------- $0000 $0400 $0800 $0C00 $1000 $1400 $1800 $1C00 +---------------+---------------+---------------+---------------+ | $6004 | $6005 | $6006 | $6007 | +---------------+---------------+---------------+---------------+ PRG Setup: --------------------------- $8000 $A000 $C000 $E000 +-------+-------+-------+-------+ | $6000 | $6001 | $6002 | $6003 | +-------+-------+-------+-------+ Powerup/Reset: --------------------------- $6003 set to $FF on cold boot. (All other registers probably also, but not required)
The present hardware seems to be:
There is additionally some weird behavior on reads from $FFE4-$FFFF:
However, the existing dumps in GoodNES have been pre-patched to not require this.
See also:
Categories: INES Mappers