INES Mapper 221: Difference between revisions
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[[Category:Multicart mappers]] | [[Category:Multicart mappers|221]] | ||
iNES Mapper 221 is used for N625092 multicarts. They have 8 KiB of unbanked CHR-RAM at PPU $0000-$1FFF. Their UNIF board name is '''BMC-N625092'''. | iNES Mapper 221 is used for N625092 multicarts. They have 8 KiB of unbanked CHR-RAM at PPU $0000-$1FFF. Their UNIF board name is '''BMC-N625092'''. | ||
Revision as of 17:46, 14 July 2018
iNES Mapper 221 is used for N625092 multicarts. They have 8 KiB of unbanked CHR-RAM at PPU $0000-$1FFF. Their UNIF board name is BMC-N625092.
Mode/Outer Bank Register ($8000-$BFFF)
A~FEDC BA98 7654 3210
-------------------
10.. ...p ...O OOPM
| | |||+- Select nametable mirroring type
| | ||| 0: Vertical
| | ||| 1: Horizontal
| | ||+-- Select NROM-128/Other PRG-ROM modes
| | || 0: NROM-128 (Inner Bank selects 16 KiB PRG-ROM bank
| | || at CPU $8000-$BFFF mirrored at CPU $C000-$FFFF)
| | || 1: Other mode (decided by bit 8)
| +-++--- Select 128 KiB Outer PRG-ROM bank.
+----------- Select PRG-ROM mode if bit 1=1
0: NROM-128 (Inner Bank SHR 1 selects 32 KiB PRG-ROM
bank at CPU $8000-$FFFF)
1: UNROM (Inner Bank selects 16 KiB PRG-ROM bank at
CPU $8000-$BFFF, CPU $C000-$FFFF fixed to Inner Bank #7)
Inner Bank Register ($C000-$FFFF)
A~FEDC BA98 7654 3210
-------------------
11.. .... .... .III
+++- 16/32 KiB (depending on PRG-ROM mode) Inner Bank number
