NES 2.0 Mapper 354 denotes three different PCBs:
It is very similar to INES Mapper 015 but has an additional PRG mode for the FDS conversion of Bubble Bobble as well as supporting larger PRG ROM sizes.
Mask: $F000
A~FEDC BA98 7654 3210 D~7654 3210
------------------- ---------
111B .... ...A CSSS pMPP PPPP
| | |||| ||++-++++- PRG A19..A14
| | |||| |+-------- Nametable mirroring
| | |||| | 0: Vertical
| | |||| | 1: Horizontal
| | |||| +--------- PRG A13 if SSS=2/5/6, ignored otherwise
| | |+++-------------- PRG banking mode
| | | 0/4: NROM-256 (PRG A14=CPU A14)
| | | 1: UNROM (PRG A14..16=111 when CPU A14=1)
| | | 2/6: NROM-64 (PRG A13=p)
| | | 3/7: NROM-128
| | | 5: FDS Conversion:
| | | $6000-$7FFF selected as in NROM-64,
| | | $8000-$FFFF selected as in NROM-256, but with
| | | PRG A15/A16 forced to 1
| | +----------------- 1=Write-protect CHR-RAM
| +------------------- PRG A20
+----------------------------- PRG A21 (submapper 1 only), must be 1 on submapper 0
PCB images and analysis of FAM250, 810331C/SCHI-24
Categories: FDS conversion mappers, Mappers with CHR RAM, Multicart mappers