NES 2.0 Mapper 401

NES 2.0 Mapper 401 denotes the KC885 multicart circuit board, used for the Super 19-in-1 (VIP19) multicart. It is basically mapper 45 with the higher address lines connected weirdly.

• PRG A13-A17: from $6000 #1 bits 0-4, same as mapper 45
• PRG A18: either from $6000 #2 bit 5 or from $6000 #1 bit 6, depending on solder pad setting
• PRG A19: either from $6000 #2 bit 6 or from $6000 #1 bit 5, depending on solder pad setting
• PRG /CE: $6000 #1 bit 7, if solder pad connected

The menu code tries the two ways of selecting PRG A18 and A19 and whether $6000 #1 bit 7 disables PRG-ROM, and selects one of eight different menus based on what it finds. Other multicarts using mapper 45's chipset do the same thing; KC885 is unique in that the standard mapper 45 way of connecting PRG-ROM will not work at all.