NES 2.0 Mapper 403 denotes the 89433 circuit board with up to 1 MiB PRG-ROM and 32 KiB of CHR-RAM, bankable with 8 KiB granularity.
Mask: $E103
D~[.PPP PPp.]
+++-+++--- PRG A19..A14
Power-on value: $00
Mask: $E103, $8000
D~[.... ..CC]
++-- CHR A14..A13
Power-on value: $00
The latch at $8000-$FFFF is enabled/disabled via the Mode register's C bit.
Mask: $E103
D~[...H .C.N]
| | +- 0: PRG A14=CPU A14 (NROM-256)
| | 1: PRG A14=p (NROM-128)
| +--- 0: Latch at $8000-$FFFF disabled
| 1: Latch at $8000-$FFFF enabled
+------ 0: Vertical mirroring
1: Horizontal mirroring
Power-on value: $00
Categories: Mappers with CHR RAM, Multicart mappers