Bandai Datach pinout

Bandai Datach: 32-pin 0.1" card edge (iNES Mapper 157)

  **CHR A13 <- |  1 32 | -- +5V
    PRG A16 <- |  2 31 | -> ??CHR A12??
    PRG A15 <- |  3 30 | -> PRG A17
    CPU A12 <- |  4 29 | -> PRG A14
     CPU A7 <- |  5 28 | -> CPU A13
     CPU A6 <- |  6 27 | -> CPU A8
     CPU A5 <- |  7 26 | -> CPU A9
     CPU A4 <- |  8 25 | -> CPU A11
     CPU A3 <- |  9 24 | -> /ExternalROMRead
     CPU A2 <- | 10 23 | -> CPU A10
     CPU A1 <- | 11 22 | <> I2C SDA
     CPU A0 <- | 12 21 | <> CPU D7
     CPU D0 <> | 13 20 | <> CPU D6
     CPU D1 <> | 14 19 | <> CPU D5
     CPU D2 <> | 15 18 | <> CPU D4
     GND    -- | 16 17 | <> CPU D3

Notes:

• Pin 1 is used for the external I²C EEPROM clock.
• Pin 31 is Naruko's educated guess

This is almost the standard JEDEC ROM pin order.

Source: Naruko