NES 2.0 Mapper 344: Difference between revisions
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.... .... .... DMCC | .... .... .... DMCC | ||
||++- Select PRG and CHR base offsets | ||++- Select PRG and CHR base offsets | ||
|| 0: PRG: $00000, CHR: $00000 (Menu) | || 0: PRG: $00000, CHR: $00000 (Menu/Street Fighter IV) | ||
|| 1: Invalid | || 1: Invalid | ||
|| 2: PRG: $20000, CHR: $40000 ( | || 2: PRG: $20000, CHR: $40000 (Contra Force) | ||
|| 3: PRG: $40000, CHR: $60000 (Guevara) | || 3: PRG: $40000, CHR: $60000 (Guevara) | ||
|+--- Select PRG-ROM mode | |+--- Select PRG-ROM mode |
Revision as of 21:32, 10 June 2018
NES 2.0 Mapper 344 is used for the Kuai Da Jin Ka Zhong Ji Tiao Zhan 3-in-1 (3-in-1,6-in-1,Unl) multicart. Its UNIF board name is BMC-GN-26.
Outer Bank and Mode Register ($6000-$7FFF, write)
Mask: $E000 A~FEDC BA98 7654 3210 ------------------- .... .... .... DMCC ||++- Select PRG and CHR base offsets || 0: PRG: $00000, CHR: $00000 (Menu/Street Fighter IV) || 1: Invalid || 2: PRG: $20000, CHR: $40000 (Contra Force) || 3: PRG: $40000, CHR: $60000 (Guevara) |+--- Select PRG-ROM mode | 0: Normal MMC3 mode | 1: MMC3 bank register 6 selects 32 KiB | PRG-ROM bank at CPU $8000-$FFFF +---- 1=CPU $8000-$FFFF becomes open bus if jumper not set (chooses between 3-in-1/6-in-1 menu)
As it uses the MMC3 clones's WRAM interface, writing to the Outer Bank register requires enabling and not write-protecting WRAM in the MMC's $A001 register.
MMC3-compatible registers
Mask: $E001 See MMC3.
Notes
- The inner PRG-ROM bank is restricted to 128 KiB, the CHR-ROM bank unrestricted.
- This description is based on testing with Nestopia Plus!, which ignores the written data.