NES 2.0 Mapper 393
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NES 2.0 Mapper 393 denotes the 820720C multicart PCB.
Registers
MMC3-compatible registers ($8000-$FFFF, write)
These registers function identically to a normal MMC3, except in UNROM/BNROM mode.
Outer Bank Register ($6000-$7FFF, write)
Mask: $E000 A~FEDC BA98 7654 3210 --------- --------- 011. .... ..MM CPPP || |+++- PRG A19..A17 || +---- CHR Mode || 0: CHR-ROM with MMC3 banking || 1: 8 KiB unbanked CHR-RAM ++------ PRG Mode 0: MMC3 (PRG A13-A16) 1: same as 0 2: BNROM (PRG A15-A16 from MMC3 R6, PRG A13-A14=CPU A13-A14) 3: UNROM (PRG A14-A16 from $8000-$FFFF latch, PRG A13=CPU A13)
Selected by the MMC3's PRG-RAM /CE, WRAM must be enabled and writable in the MMC3's A001 register for Outer Bank Register writes to be recognized.