NES 2.0 Mapper 324 is used for Farid's homebrew 8-in-1 UNROM multicart board. It consists of an UNROM latch with an additional outer bank register. Mirroring is hard-wired. Its UNIF board name is FARID_UNROM_8-IN-1.
Mask: $8000 D~7654 3210 **BUS CONFLICTS** --------- Cooo kIII |||| |||| |||| |+++- Standard UNROM inner bank (select 16K at $8000-$BFFF) |||| +---- 1=Lock Outer Bank |+++------ Select 128 KiB outer PRG-ROM bank +--------- Clock Generator ("oook" bits latched only when this changes from 0 to 1 if k had been 0)
The middle four bits ($78, lowercase) are one 74'161; their contents are explicitly zeroed on power-up or reset. The outer four bits ($87, uppercase) are the other 74'161; their contents are NOT.
See INES Mapper 002.
Categories: Discrete logic mappers, Multicart mappers