NES 2.0 Mapper 358 denotes a variation of NES 2.0 Mapper 282 with partially overlapping PRG/CHR outer banks:
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.
Categories: Multicart mappers, Mappers with cycle IRQs, Mappers with scanline IRQs, Mappers using J.Y. Company ASIC, Mappers with ROM nametables