NES 2.0 Mapper 261: Difference between revisions
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|| | 0: NROM-128 (16 KiB PRG-ROM at $8000-$BFFF, mirrored) | || | 0: NROM-128 (16 KiB PRG-ROM at $8000-$BFFF, mirrored) | ||
|| | 1: NROM-256 (32 KiB PRG-ROM at $8000-$FFFF) | || | 1: NROM-256 (32 KiB PRG-ROM at $8000-$FFFF) | ||
++-+--------- Select 32 KiB | ++-+--------- Select 32 KiB PRG-ROM bank in NROM-256 mode/ | ||
bits 1-3 of 16 KiB PRG-ROM bank in NROM-128 mode | bits 1-3 of 16 KiB PRG-ROM bank in NROM-128 mode | ||
The first game on that multicart, ''Elfland'', is actually a CNROM game that writes to the multicart address latch to switch CHR-ROM banks. | The first game on that multicart, ''Elfland'', is actually a CNROM game that writes to the multicart address latch to switch CHR-ROM banks. | ||
Revision as of 09:43, 8 March 2018
NES 2.0 Mapper 261 was assigned by FCEUX for the 200-in-1 - Elfland multicart. Its UNIF board name is BMC-810544-C-A1.
Address latch
A~1... ..PP PmpM CCCC
|| |||| ++++- Select 8 KiB CHR-ROM bank at PPU $0000-$1FFF
|| |||+------ Select nametable mirroring type
|| ||| 0: Vertical
|| ||| 1: Horizontal
|| ||+------- Lowest bit of 16 KiB PRG-ROM bank number
|| || at CPU $8000-$BFFF/$C000-$FFF in NROM-128 mode
|| |+-------- PRG-ROM banking mode
|| | 0: NROM-128 (16 KiB PRG-ROM at $8000-$BFFF, mirrored)
|| | 1: NROM-256 (32 KiB PRG-ROM at $8000-$FFFF)
++-+--------- Select 32 KiB PRG-ROM bank in NROM-256 mode/
bits 1-3 of 16 KiB PRG-ROM bank in NROM-128 mode
The first game on that multicart, Elfland, is actually a CNROM game that writes to the multicart address latch to switch CHR-ROM banks.
