NES 2.0 Mapper 394: Difference between revisions
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{{DEFAULTSORT:394}}[[Category:Multicart mappers]][[Category:MMC3-like mappers]][[Category:Mappers with scanline IRQs]][[Category:Mappers with cycle IRQs]] | {{DEFAULTSORT:394}}[[Category:Multicart mappers]][[Category:MMC3-like mappers]][[Category:Mappers with scanline IRQs]][[Category:Mappers with cycle IRQs]][[Category:Multi-ASIC mappers]] | ||
'''NES 2.0 Mapper 394''' denotes Realtec's '''HSK007''' multicart PCB. Unusually, it can be set to function either as an [[MMC3]] clone or as a [[J.Y. Company ASIC]]. | '''NES 2.0 Mapper 394''' denotes Realtec's '''HSK007''' multicart PCB. Unusually, it can be set to function either as an [[MMC3]] clone or as a [[J.Y. Company ASIC]]. | ||
Latest revision as of 09:53, 18 June 2022
NES 2.0 Mapper 394 denotes Realtec's HSK007 multicart PCB. Unusually, it can be set to function either as an MMC3 clone or as a J.Y. Company ASIC.
Mode Register ($5009, write)
Mask: unknown, but A3 must be set
D~7654 3210
---------
...M M..B
| | +- PRG/CHR A18
+-+---- Mapper Mode
0: BNROM
1: MMC3
2: J.Y. Company ASIC
3: Same as 2
Power-on value: $0F
Outer Bank Register ($500B, write)
Mask: unknown, but A3 must be set
D~7654 3210
---------
cC.p PBB.
|| | |++-- PRG A16..A15 in BNROM mode
|| | +---- PRG A17 if p=0
|| +------ PRG A17 in MMC3 mode
|| 0: From Outer Bank Register (128 KiB inner bank)
|| 1: From MMC3 (256 KiB inner bank)
|+-------- CHR A17 if c=0
+--------- CHR A17 in MMC3 mode
0: From Outer Bank Register (128 KiB inner bank)
1: From MMC3 (256 KiB inner bank)
Power-on value: $10
In J.Y. Company ASIC Mode, PRG/CHR A17 always come from the J.Y. Company ASIC.
