NES 2.0 Mapper 396

NES 2.0 Mapper 396 denotes the 晶太 YY850437C multicart PCB, basically an UNROM mapper with an outer bank register.

Outer Bank Register ($A000)

Mask: unknown, probably $C000

D~7654 3210
  ---------
  .M.. .ppp
   |    +++- PRG A19..A17
   +-------- 0: Vertical mirroring
             1: Horizontal mirroring

No bus conflicts.

Inner Bank Register ($C000-$FFFF)

Mask: unkonwn, probably $C000

D~7654 3210
  ---------
  .... .PPP
        +++- PRG A16..A14 if CPU A14=0

Unknown if bus conflicts occur here.