NES 2.0 Mapper 406: Difference between revisions
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NES 2.0 Mapper 406 is used | [[Category:MMC3-like mappers]][[Category:Mappers with scanline IRQs]][[Category:NES 2.0 mappers with submappers]] | ||
'''NES 2.0 Mapper 406''' is used for the homebrew game ''Haradius Zero''. It is basically a homebrew [[TLROM]] circuit board that connects the [[MMC3]]'s address lines differently, and saves the high score to flash ROM. The game executes the flash ROM chip's "Software ID" command; if the manufacturer and model ID do not match the expected values, or it detects that WRAM exists, the game replaces the first level with an unwinnable boss fight. | |||
'''Submapper 0''' denotes the 60-pin release of the game (saying "AXR" at the bottom of the title screen). The MMC3's A0 input is actually connected to CPU A1, so that $8000/$8002 rather than $8000/$8001 are differentiated. The Flash ROM chip is a Macronix MX29F040 (manufacturer ID=$C2, model ID=$A4). | |||
'''Submapper 1''' denotes the 72-pin release of the game (saying "INL" at the bottom of the title screen). The MMC3's $8xxx and $Exxx registers are swapped, so that $8000/$8001 enables/disable IRQ generation, and $E000/$E001 write to bank registers. The Flash ROM chip is an AMD AM29F040 (manufacturer ID=$01, model ID=$A4). | |||
Revision as of 13:56, 18 December 2021
NES 2.0 Mapper 406 is used for the homebrew game Haradius Zero. It is basically a homebrew TLROM circuit board that connects the MMC3's address lines differently, and saves the high score to flash ROM. The game executes the flash ROM chip's "Software ID" command; if the manufacturer and model ID do not match the expected values, or it detects that WRAM exists, the game replaces the first level with an unwinnable boss fight.
Submapper 0 denotes the 60-pin release of the game (saying "AXR" at the bottom of the title screen). The MMC3's A0 input is actually connected to CPU A1, so that $8000/$8002 rather than $8000/$8001 are differentiated. The Flash ROM chip is a Macronix MX29F040 (manufacturer ID=$C2, model ID=$A4).
Submapper 1 denotes the 72-pin release of the game (saying "INL" at the bottom of the title screen). The MMC3's $8xxx and $Exxx registers are swapped, so that $8000/$8001 enables/disable IRQ generation, and $E000/$E001 write to bank registers. The Flash ROM chip is an AMD AM29F040 (manufacturer ID=$01, model ID=$A4).
