INES Mapper 043: Difference between revisions
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{{DEFAULTSORT:043}}[[Category:iNES Mappers]][[Category:FDS conversion mappers]][[Category:Mappers with cycle IRQs]]iNES Mapper 043 is used for Whirlwind Manu's second attempt (cartridge number LF36) at converting ''Super Mario Bros. 2'' from the Famicom Disk System to a ROM cartridge. Their first attempt (cartridge number LE10, [[NES 2.0 Mapper 304]]) hangs after completing level 4-4. Its UNIF board name is '''UNL-SMB2J''', along with several incompatible boards annoyingly all carrying the same UNIF MAPR. | {{DEFAULTSORT:043}}[[Category:iNES Mappers]][[Category:FDS conversion mappers]][[Category:Mappers with cycle IRQs]]iNES Mapper 043 is used for Whirlwind Manu's second attempt (cartridge number LF36) at converting ''Super Mario Bros. 2'' from the Famicom Disk System to a ROM cartridge. Their first attempt (cartridge number LE10, [[NES 2.0 Mapper 304]]) [https://archive.org/details/youtube-M2-ovBQW978 hangs on real hardware] after completing level 4-4. Its UNIF board name is '''UNL-SMB2J''', along with several incompatible boards annoyingly all carrying the same UNIF MAPR. | ||
=Banks= | =Banks= | ||
Revision as of 05:29, 20 April 2018
iNES Mapper 043 is used for Whirlwind Manu's second attempt (cartridge number LF36) at converting Super Mario Bros. 2 from the Famicom Disk System to a ROM cartridge. Their first attempt (cartridge number LE10, NES 2.0 Mapper 304) hangs on real hardware after completing level 4-4. Its UNIF board name is UNL-SMB2J, along with several incompatible boards annoyingly all carrying the same UNIF MAPR.
Banks
- CPU $5000-$5FFF: 4 KiB PRG-ROM bank, fixed to #16 or #17 depending on DIP switch value (determines whether the title screen has the SMB2 logo or not)
- CPU $6000-$7FFF: 8 KiB PRG-ROM bank, fixed to #2
- CPU $8000-$9FFF: 8 KiB PRG-ROM bank, fixed to #1
- CPU $A000-$BFFF: 8 KiB PRG-ROM bank, fixed to #0
- CPU $C000-$DFFF: 8 KiB PRG-ROM bank, switchable
- CPU $E000-$FFFF: 8 KiB PRG-ROM bank, fixed to #9
- PPU $0000-$1FFF: unbanked 8 KiB CHR-ROM
Registers
PRG Bank Select ($4022)
Mask: $71FF
Bit 7654 3210
---------
.... .CCC
+++- Select 8 KiB PRG-ROM bank at CPU $C000-$DFFF.
The actual bank number is:
Value Bank# ------------ 0 4 1 3 2 4 3 4 4 4 5 7 6 5 7 6
IRQ Control ($8122)
Mask: $71FF
Bit 7654 3210
---------
.... ..II
++- 0: Acknowledge and disable IRQ, reset counter
1-3: Enable IRQ
When enabled, the 12-bit IRQ counter increases on every M2 cycle until it overflows, upon which an IRQ is fired.
