POLE POSITION ------------- Video board, 30 pins, 15 per side, numbered side is back of board, letters are on component side. Items in parenthesis aren't listed on schematic: 1 GND A GND 2 +5 volts B +5 volts 3 GND C GND (keyway) 4 GND D GND 5 GND E GND 6 GND F GND 7 GND H GND 8 GND J GND 9 Red K GND 10 Green L GND 11 Composite sync (inverted) M GND 12 Blue N GND 13 Video return P GND 14 + sense R (+5 volts) 15 - sense S GND CPU board, 44 pins, 22 per side, numbered side is back of board, letters are on component side. Items in parenthesis aren't listed on schematic: 1 GND A GND 2 +5 vols B +5 volts 3 GND C GND (keyway) 4 GND for shifter D GND (coin door 1) 5 GND for brake E GND (utility panel 4) 6 Brake F Gas pedal wiper 7 Start 0 H Steering 2 (steering pin 1) 8 Steering 1 (steering pin 4) J Right coin counter 2 (utility panel 6) 9 Left coin counter 1 (utility panel 7) K Test switch (utility panel 5) 10 Service switch (utility panel 9) L Coin 2 (coin door 2) 11 Coin 1 (coin door 3) M Start 1 12 Shifter N GND 13 (vol. GND) P vol. GND for gas 14 (vol. VCC) R vol. VCC for gas 15 Sound 2+ S GND 16 Sound 4+ T Sound 1+ 17 GND U Audio GND for channels 1 & 3 18 Sound 3+ V Audio GND for channels 2 & 4 19 Sound 1- W Sound 4- 20 Sound 3- X Sound 2- 21 + sense Y +5 for steering (steering pin 2) 22 - sense Z GND for steering (steering pin 3) For upright game, connect the following on the CPU board: 18 to T and 19 to 20 to strap sound outputs 1 and 3 together 15 to 16 and X to W to strap sound outputs 2 and 4 together 7 to M for automatic game start (a start switch could go here) 5 to 6 to account for lack of brake pedal Audio outputs need to go to an amplifier (won't drive a speaker directly). Gas pedal is a 5K pot. DIP 1 9L OR 9E ----------- 1 2 3 4 5 6 7 8 OFF 90 SECONDS ON 120 ON OFF A PRELIM RACE OFF OFF B DIFFICULTY OFF ON C ON ON D ON OFF A EXTEND RACE OFF OFF B DIFFICULTY ON ON C OFF ON D ON OFF 3 # OF LAPS OFF OFF 4 ON ON 5 OFF ON 6 OFF AVERAGE SPEED ON HIGH SPEED DIP 2 9JA OR 7E --------------- 1 2 3 4 5 6 7 8 OFF OFF OFF 1/1 COIN/CREDIT ON OFF OFF 1/2 LEFT MECH OFF ON OFF 1/3 ON ON OFF 2/1 OFF OFF ON 3/1 ON OFF ON 3/2 OFF ON ON 4/3 ON ON ON FREE PLAY OFF OFF 1/1 RIGHT MECH ON OFF 2/1 OFF ON 3/2 ON ON 1/6 OFF KPH ON MPH OFF ATTRACT SOUND ON ON OFF OFF NORMAL ON FREEZE SCREEN