Konami QT adapter pinout

                    +-----+
             GND -- |01 21| -- VCC
          CPU A6 -> |02 22| <- CPU A8
         CPU A11 -> |03 23| <- CPU A9
          CPU A4 -> |04 24| <- CPU A5
          CPU A3 -> |05 25| <- CPU A10
          CPU A2 -> |06 26| <> CPU D7
         CPU A12 -> |07 27| <- CPU A7
          CPU D6 <> |08 28| <- CPU R/W
          CPU D5 <> |09 29| <- CPU A1
          CPU D4 <> |10 30| <- CPU A0
             GND -- |11 31| -- GND
          CPU D3 <> |12 32| <> CPU D0
          CPU D2 <> |13 33| <> CPU D1
         PRG A13 -> |14 34| <- PRG A14
         PRG A15 -> |15 35| <- PRG A16
EXT PRG ROM0 /CE -> |16 36| <- PRG A17
EXT PRG ROM1 /CE -> |17 37| <- EXT PRG ROM2 /CE
                  ? |18 38| <- PRG RAM A12
EXT PRG RAM /CE  -- |19 39| ?    
             VCC -- |20 40| -- VCC
                    +-----+

Notes:

• Pins 1-20 are on label side

Source:

• BBS