NES 2.0 Mapper 344: Difference between revisions
From NESdev Wiki
Jump to navigationJump to search
NewRisingSun (talk | contribs) (Correction, no longer guided by ROM file with misordered banks.) |
m (defaultsort) |
||
| Line 1: | Line 1: | ||
[[Category:Multicart mappers]][[Category:MMC3-like mappers]][[Category:Mappers with scanline IRQs]] | {{DEFAULTSORT:344}}[[Category:Multicart mappers]][[Category:MMC3-like mappers]][[Category:Mappers with scanline IRQs]] | ||
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'''. | 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'''. | ||
Revision as of 06:56, 26 May 2020
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
-------------------
.... .... ..oo DSOO
|| ||++- PRG/CHR A17..A18 when S=0
|| |+--- Select PRG-ROM mode
|| | 0: Normal MMC3 mode
|| | 1: Pseudo-NROM: MMC3 bank register 6 bits 1-3
|| | provides PRG A14..A16 for CPU $8000-$FFFF
|| +---- PRG A14 mode when S=1
|| 0: PRG A14=CPU A14 (NROM-256)
|| 1: PRG A14=MMC3 bank register 6 bit 1
++------ PRG/CHR A17..A18 when S=1
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.
