Sachen 74LS374N pinout

Sachen “74LS374N”: 20-pin 0.3" DIP or epoxy blob on daughterboard (Canonically iNES Mapper 243)

Most of Sachen's mapper ICs have names that collide with other well-known ICs, presumably as an initial round of indirection to confuse would-be mass copiers. The 74LS374N is canonically an octal latch (Unlike the 74377, the actual '374 would require other support hardware to be used on the NES)

             .---V---.
  PRG A15 <- | 01 20 | -- Vcc
CIRAM A10 <- | 02 19 | <- CPU A8
  PPU A11 -> | 03 18 | <- R/W
        ? ?? | 04 17 | <- M2
  CPU A14 -> | 05 16 | <- PPU A10
  CPU  A0 -> | 06 15 | <- /ROMSEL
  CPU  D0 <> | 07 14 | <> CPU  D2
  CPU  D1 <> | 08 13 | -> CHR A16/A14
  CHR A13 <- | 09 12 | -> CHR A15/A13
      Gnd -- | 10 11 | -> CHR A14/A15
             '-------'

Nestopia's source asserts that at least one variant of this mapper can be read from.

It's not clear exactly what Санчез meant with the alternate CHR bank pins, or what the implication for emulation is, or why the two haven't been allocated separate mapper numbers.

Reference: Санчез ( http://cah4e3.shedevr.org.ru/%5Blst%5D-sachen-mappers.txt )