NES 2.0 Mapper 334: Difference between revisions
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NewRisingSun (talk | contribs) (Created page with "Category:Multicart mappersCategory:MMC3-like mappers NES 2.0 mapper 334 is used for the ''5/20-in-1 1993 Copyright'' multicart. ==PRG-ROM Bank Register ($6000, write)...") |
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[[Category:Multicart mappers]][[Category:MMC3-like mappers]] | {{DEFAULTSORT:334}}[[Category:Multicart mappers]][[Category:MMC3-like mappers]] | ||
NES 2.0 mapper 334 is used for the ''5/20-in-1 1993 Copyright'' multicart. | NES 2.0 mapper 334 is used for the ''5/20-in-1 1993 Copyright'' multicart. | ||
Latest revision as of 06:50, 26 May 2020
NES 2.0 mapper 334 is used for the 5/20-in-1 1993 Copyright multicart.
PRG-ROM Bank Register ($6000, write)
Mask: probably $6003
D~7654 3210
---------
.... .PP.
++- Select 32 KiB PRG-ROM bank at CPU $8000-$FFFF
Unknown Register ($6001, write)
Mask: probably $6003
Unknown meaning; the menu writes $01 to it.
Jumper Register ($6002, read)
Mask: probably $6003 D~7654 3210 --------- OOOO OOOJ |||| |||+- Jumper setting |||| ||| 0: Show 20-in-1 menu (i.e. with repeats) |||| ||| 1: Show 5-in-1 menu (i.e. without repeats) ++++-+++-- Open bus
The "hardware test" menu (seen when pressing SELECT+A+B during the menu) expects the jumper at zero.
MMC3-compatible registers
Mask: $E001
See MMC3.
Notes
The MMC3 clone is only used for Mirroring and CHR-ROM banking; the PRG-ROM bank comes entirely from an additional register. As they use the MMC3 clones's WRAM interface, accessing the $600x registers requires enabling and not write-protecting WRAM in the MMC's $A001 register.
