NES 2.0 Mapper 336: Difference between revisions
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* 11-in-1 (K-3046) | * 11-in-1 (K-3046) | ||
* 2-in-1 (YH-217) | * 2-in-1 (YH-217) | ||
* | * 4-in-1 (YH-4109) | ||
'''Submapper 1:''' | '''Submapper 1:''' | ||
* Top Gun III 2-in-1 | * Top Gun III 2-in-1 | ||
'''Submapper 2:''' | '''Submapper 2:''' | ||
* | * 2-in-1 (YH-218) | ||
=Banks= | =Banks= | ||
Revision as of 15:35, 6 June 2024
NES 2.0 mapper 336 is used for multicarts containing several UNROM games. Its UNIF board name is BMC-K-3046.
Submapper 0:
- 11-in-1 (K-3046)
- 2-in-1 (YH-217)
- 4-in-1 (YH-4109)
Submapper 1:
- Top Gun III 2-in-1
Submapper 2:
- 2-in-1 (YH-218)
Banks
- CPU $8000-$BFFF: Switchable 16 KiB inner PRG-ROM bank and switchable 128 KiB outer PRG-ROM bank
- CPU $C000-$FFFF: Fixed 16 KiB inner PRG-ROM bank #7 and switchable 128 KiB outer PRG-ROM bank
- PPU $0000-$1FFF: Unbanked 8 KiB CHR-RAM
Data Latch ($C000-$FFFF)
Mask: $8000
D~7654 3210
---------
..OO OIII
|| |+++- Select 16 KiB inner PRG-ROM bank at CPU $8000-$BFFF
++-+---- Select 128 KiB outer PRG-ROM bank at CPU $8000-$FFFF
| +---- Mirroring (Submapper 2), 1=H, 0=V
+------- Mirroring (Submappers 0/1), 1=H, 0=V
Note
Submappers 0 and 2 have no bus conflicts. Submapper 1 does: D0-D2 are affected by normal AND-type bus conflicts, while D3 has a resistor in the signal path to ensure that the ROM bit always "wins", similar to INES Mapper 144. This behavior is necessary for proper function.
