NES 2.0 Mapper 435 denotes the F-1002 multicart circuit board mounting 2 MiB of PRG-ROM plus 8 KiB of unbanked CHR-RAM. It is basically a larger version of NES 2.0 Mapper 380.
[A~1... CQOQ .QQP PpMS]
|||| ||| |||+-0: PRG A14=CPU A14
|||| ||| ||| 1: PRG A14=p
|||| ||| ||+- 0: Vertical mirroring
|||| ||| || 1: Horizontal mirroring
|||| ||+-++-- PRG A16..A14 (inner bank)
|+|+--++------ PRG A20..A17 (outer bank)
| +----------- 0: When CPU A14=1: PRG A16..14=111 (UNROM)
| 1: When CPU A14=1: PRG A16..14=PPp (NROM)
+------------- 0: CHR-RAM writeable
1: CHR-RAM write-protected
Power-on value: 0
Effective meaning:
Bit 9 Bit 0 Meaning $200s $001s (O) (S) 0 ? Switchable inner 16 KiB bank PPp at CPU $8000-$BFFF, fixed inner bank #7 at CPU $C000-$FFFF (UNROM) 1 0 Switchable 32 KiB inner bank PP at CPU $8000-$FFFF (NROM-256) 1 1 Switchable 16 KiB inner bank PPp at CPU $8000-$BFFF, mirrored at CPU $C000-$FFFF (NROM-128)
Because all bits are cleared on reset, CPU $8000-$BFFF is set to 16 KiB bank #0, and $C000-$FFFF is set to 16 KiB bank #7 on reset.
Categories: Mappers with CHR RAM, Multicart mappers