NES 2.0 Mapper 351
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NES 2.0 Mapper 351 is used for a Techline 9-in-1 multicart. It's an MMC3 clone with outer bank registers.
Set CHR-ROM Base ($5000, write)
Mask: unknown D~7654 3210 --------- BBBB BB.. ++++-++--- Select 8 KiB CHR-ROM base to be OR'ed with MMC3 bank number
Set PRG-ROM Base ($5001, write)
Mask: unknown D~7654 3210 --------- BBBB BB.. ++++-++--- Select 16 KiB PRG-ROM base to be OR'ed with MMC3 bank number
Set Banking Mode ($5002, write)
Mask: unknown D~7654 3210 --------- MMmm .?.. |||| +--- Unknown ||++------ Select outer bank size for CHR-ROM (and PRG-ROM in MMC3 mode) || 0: 256 KiB || 1: 32 KiB || 2: 128 KiB || 3: unknown, not used ++-------- PRG banking mode 0: MMC3 1: same as 0 2: NROM-256 3: NROM-128
Note
The circuit board detects Reset via interruption of the M2 signal to return to the multicart menu. This makes it difficult to dump the cartridge using a Kazzo device.