DEFENDER ------------ CPU BD ROM BD J3 J4 J2 J3 J4 ------------------------- -------------------------------- 1 1 VID RED 1 GND 1 AUTO-UP 1 KEY 2 GND 2 VID GN 2 GND 2 MAN-DOWN 2 SEL 1 |----- 3 GND 3 VID BL 3 KEY 3 3 SEL 0 | TO 4 KEY 4 GND 4 +5V 4 HI SCORE 4 SEL 3 | SOUND 5 +12V 5 V SYNC 5 LFT COIN 5 SEL 2 | BOARD 6 6 H SYNC 6 6 SEL 5 | 7 +5V 7 COMP SYNC 7 7 SEL 4 |----- 8 +12V 8 8 HS 9 -5V 9 KEY 9 10 INTFC BD SOUND BD J2 J3 J1 J2 J3 J4 ------------------------- ---------------------------------- 1 UP 1 1 FIRE 1 1 1 SP 1 KEY 1 VOL CTRL IN 2 FIRE 2 2 THRUST 1 2 +12V 2 SP 2 SEL 1 2 VOL CTRL OUT 3 THRUST 2 3 SM BOMB 1 3 +5V 3 GND 3 SEL 0 3 KEY 4 SM BOMB 2 4 HYPER 1 4 4 GND 4 SEL 3 4 GND 5 HYPER 2 5 2 START 5 GND 5 SEL 2 6 KEY 6 1 START 6 6 SEL 5 7 REV 2 7 REV 1 7 KEY 7 SEL 4 8 DOWN 2 8 DOWN 1 8 -12V 8 HS NOT 9 UP 2 9 KEY 9 9 10 GND 10 GND