UNIF/FARID UNROM 8-IN-1

UNIF MAPR FARID_UNROM_8-IN-1 (note underscores) describes a multicart designed by Farid in 2013. It contains eight 128 KiB UNROM games.

It adds a shadowed "outer bank" register on top of the normal UNROM banking register:

Note: bus conflicts are present!

$8000-$FFFF: [KOOO .III]
              ||||  |||
              ||||  +++-- Normal UNROM bank register; now inner bank
              |+++------- Outer bank
              +---------- 0 then 1: Latch value written to outer bank and prevent any subsequent writes to outer bank

On both warm and cold boot, the outer bank register is cleared (and the ability to latch a new outer bank is re-enabled).

Like normal UNROM, the III bits ignore the status of K.

See also:

• http://forums.nesdev.org/viewtopic.php?t=11099