NES 2.0 Mapper 358

NES 2.0 Mapper 358 denotes a variation of NES 2.0 Mapper 282 with partially overlapping PRG/CHR outer banks:

1997 Super Game 7-in-1 (JY-016) (PCB YY860606C, 512 kiB PRG-ROM)
1998 Super HiK 5-in-1 (JY-113) (PCB YY860606C, 512 kiB PRG-ROM)
1998 Super HiK 6-in-1 (JY-117) (unmarked PCB, 1024 KiB PRG-ROM)

Outer Bank Register ($D003)

Mask: $F803

7654 3210
---- ----
..M. .ppC
  |   ||+-- CHR-ROM A18 if M=0, ignored if M=1
  |   ++--- PRG-ROM A18-A19
  |   +---- CHR-ROM A19
  +-------- Outer CHR bank size and selection
             0: Mask to 256 KiB, use C
             1: Mask to 512 KiB, ignore C

PRG ($8000-$8FFF) bank select register bits that select 256 KiB banks are masked off. Dumping the CHR-ROM does not work reliably in 1 KiB CHR-ROM banking mode.

For a description of all other registers, see J.Y. Company ASIC.

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