NES 2.0 Mapper 416 denotes the PCB used for a 4-in-1 multicart that includes the N-32 cartridge conversion of SMB2J.
Write to $8000 (mask $8000):
D~[BPA. Mcc.]
||| |++--- CHR A14..A13
||| |+---- 1=Horizontal, 0=Vertical mirroring
||| +----- PRG A16, also select SMB2J (0)/Normal (1) mode
||+-------- PRG A14 in Normal mode
+|--------- PRG A15 in Normal mode
++--------- 00: NROM-064 banking (PRG A13=0, PRG A14=A)
01: NROM-128 banking (PRG A13=CPU A13, PRG A14=A)
1x: NROM-256 banking (PRG A13=CPU A13, PGR A14=CPU A14)
Write to $4020 (mask unknown)
D~[.... .BAC]
||+- PRG A15
++-- PRG A14..13
Write to $4120 (mask unknown)
D~[.... ...E]
+- 1=Counting, generate IRQ on 12-bit counter overflow
0=Counter reset, acknowledge/disable IRQ
Categories: FDS conversion mappers, Mappers with fixed-timing cycle IRQs, Multicart mappers