iNES Mapper 058 is used for a number of simple NROM-/CNROM-based multicarts:
Mask: $8000
A~FEDC BA98 7654 3210
-------------------
1... .... MSCC CPPP
|||| |+++- PRG A16..A14
||++-+---- CHR A15..A13
|+-------- PRG Mode
| 0: NROM-256 (PRG A14=CPU A14)
| 1: NROM-128
+--------- Nametable mirroring
0: Vertical
1: Horizontal
Categories: Multicart mappers, INES Mappers