44 Pin Wiring List for P20: COMPONENT SIDE | SOLDER SIDE --------------------------------|----------------------------------- + 5 V Return | A | 1 | + 5 V Return ----------------------------|---|---|------------------------------- + 5 V | B | 2 | + 5 V ----------------------------|---|---|------------------------------- 1P Tball Horiz. Clock | C | 3 | + 22 V DC (Note 1) ----------------------------|---|---|------------------------------- 1P Tball Vert. Clock | D | 4 | - 22 V DC (Note 1) ----------------------------|---|---|------------------------------- +10.3 V DC (Note 1) | E | 5 | 1P Tball Horiz. Dir. ----------------------------|---|---|------------------------------- 2P Tball Horiz. Clock | F | 6 | 1P Tball Vert. Dir. ----------------------------|---|---|------------------------------- 2P Tball Vert. Clock | H | 7 | 2P Tball Vert. Dir. ----------------------------|---|---|------------------------------- 2P DOWN (Note 2) | J | 8 | 2P Tball Horiz. Dir. ----------------------------|---|---|------------------------------- 2P RIGHT (Note 2) | K | 9 | 1P LEFT (Note 2) ----------------------------|---|---|------------------------------- 2P LEFT (Note 2) | L | 10| 1P RIGHT (Note 2) ----------------------------|---|---|------------------------------- 1P DOWN (Note 2) | M | 11| 1P UP (Note 2) ----------------------------|---|---|------------------------------- 1P Fire Button | N | 12| 2P UP (Note 2) ----------------------------|---|---|------------------------------- 2P Start | P | 13| 2P FIRE (Note 2) ----------------------------|---|---|------------------------------- Tilt Switch | R | 14| 1P Start ----------------------------|---|---|------------------------------- Coin Aux. | S | 15| N.C. ----------------------------|---|---|------------------------------- Left Coin Slot | T | 16| Cocktail (Note 3) ----------------------------|---|---|------------------------------- Right Coin Slot | U | 17| Self Test ----------------------------|---|---|------------------------------- RESET | V | 18| +10.3 V DC (Note 1) ----------------------------|---|---|------------------------------- -22 V DC (Note 1) | W | 19| N.C. ----------------------------|---|---|------------------------------- +22 V DC (Note 1) | X | 20| N.C. ----------------------------|---|---|------------------------------- + 5 V | Y | 21| 5V Sense ----------------------------|---|---|------------------------------- GND | Z | 22| 5V Sense RET -------------------------------------------------------------------- Notes: 1 - This input voltage is unregulated. 2 - Joystick inputs for alternate player control. 3 - Ground for Cocktail type cabinet, unused in Upright games. 24 Pin Wiring List for P19: COMPONENT SIDE | SOLDER SIDED --------------------------------|----------------------------------- Right Coin Counter | A | 1 | Audio 2 Out (Note 4) ----------------------------|---|---|------------------------------- Audio Ground | B | 2 | Audio 1 Out (Note 4) ----------------------------|---|---|------------------------------- Left Coin Counter | C | 3 | 1P Start LED (Note 5) ----------------------------|---|---|------------------------------- N.C. | D | 4 | 2P Start LED (Note5) ----------------------------|---|---|------------------------------- N.C. | E | 5 | N.C. ----------------------------|---|---|------------------------------- N.C. | F | 6 | Horiz Sync(+) ----------------------------|---|---|------------------------------- Video Return | H | 7 | Composite Sync (Inverted) ----------------------------|---|---|------------------------------- N.C. | J | 8 | Vert Sync(+) ----------------------------|---|---|------------------------------- GND | K | 9 | N.C. ----------------------------|---|---|------------------------------- GND | L | 10| Video Blue ----------------------------|---|---|------------------------------- GND | M | 11| Video Green ----------------------------|---|---|------------------------------- Ground (Coin Door) | N | 12| Video Red -------------------------------------------------------------------- Notes: 4 - Both Audio Outputs are only used with original Atari Audio/Regulator II boards. Use only one output for use with a single external audio amplifier. 5 - Connect to Cathode of Start Button LEDs, Anodes to +5 Volts through a 330-ohm current limiting resistor.