Bandai FCG pinout

Bandai FCG board-1/LZ93D36 and FCG-2: 42-pin shrink PDIP (iNES Mapper 016)

            .---\/---.
       ? ?? |  1  42 | -- +5V
      M2 -> |  2  41 | ?? ?
 CPU A13 -> |  3  40 | -> PRG A17
 CPU A14 -> |  4  39 | -> PRG A15
  CPU A3 -> |  5  38 | -> PRG A14
  CPU A2 -> |  6  37 | -> PRG A16
  CPU A1 -> |  7  36 | <- CPU D7
  CPU A0 -> |  8  35 | <- CPU D6
 /ROMSEL -> |  9  34 | <- CPU D5
  CPU D0 -> | 10  33 | <- CPU D4
  CPU D1 -> | 11  32 | <- CPU D3
  CPU D2 -> | 12  31 | -> /IRQ
     R/W -> | 13  30 | -> CIRAM A10
 PPU /RD -> | 14  29 | -> CHR A17
 CHR A15 <- | 15  28 | -> CHR A14
 CHR A12 <- | 16  27 | -> CHR A13
 PPU A10 -> | 17  26 | -> CHR A11
 PPU A11 -> | 18  25 | -> CHR A16
 PPU A12 -> | 19  24 | -> CHR A10
 PPU A13 -> | 20  23 | -> CHR /CE
     GND -- | 21  22 | <- ?
            '--------'

Pin 22 is grounded on at least one FCG-1 board and floating on at least one FCG-2.