NES 2.0 Mapper 372

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NES 2.0 Mapper 372 is used for a revision of the Rockman I-VI multicart (PCB ID SFC-12). It is INES Mapper 045 but with one bit of outer bank register #2 working as a CHR-ROM/RAM switch.

CHR-AND, CHR-OR/PRG-OR MSB, CHR source ($6000 #2, write)

Mask: $F001

D~7654 3210
  ---------
  PPRC cccc
  |||| ++++- Select number of CHR bits from MMC3
  ||||       ($F: 256 KiB, $E: 128 KiB ... $7-$0: 1 KiB)
  |||+------ Select CHR A18
  ||+------- Select CHR-ROM (0)/CHR-RAM (1, unbanked)
  ++-------- Select CHR A20-A21 and PRG A21-22

Note that the CHR-RAM bit works in the opposite direction from NES 2.0 Mapper 356.