Expansion Connector Pinout [made by Kevin Horton (khorton@iquest.net)] -------------------------- +-------\ +5V |01 48| +5V GND |02 47| GND Audio In |03 46| NC R/W |04 45| Out2 (from CPU) A15 |05 44| Out1 (from CPU) cart con. pin #51 |06 43| Out0 (from CPU- strobe on sticks) Cart con. pin #52 |07 42| Cart con. pin #16 Cart con. pin #53 |08 41| Cart con. pin #17 Cart con. pin #54 |09 40| Cart con. pin #18 Cart con. pin #55 |10 39| Cart con. pin #19 /OE for stick 2 |11 38| Cart con. pin #20 Player #1 D1 |12 37| /OE for stick 1 Player #1 D3 |13 36| Player #1 D4 /IRQ |14 35| Player #1 D0 Player #2 D2 |15 34| /OE for stick 1 Player #2 D3 |16 33| Player #1 D2 /OE for stick 2 |17 32| D0 Player #2,D4 |18 31| D1 Player #2,D0 |19 30| D2 Player #2,D1 |20 29| D3 Audio out |21 28| D4 Video out |22 27| D5 +9V |23 26| D6 4.00MHz CLK |24 25| D7 +-------/ Expansion Connector NOTES: Pins 06-10 and 38-42 Come directly from the cartridge connector. With those pins, you can pass 10 bits of whatever you like to/from the expansion port to/from a cartridge board.