DIG DUG Typed in by : Rick Schieve This is Dig Dug made easy. No fooling around with all t

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DIG DUG Typed in by : Rick Schieve This is Dig Dug made easy. No fooling around with all the extra +5 VDC return lines and other baloney done with the audio/regulator board and Atari power supply. A standard +5/+12 VDC game supply will run this fine. A - ground 1 - ground B - +5 VDC 2 - +5 VDC C - 3 - D - 4 - E - 5 - F - 6 - H - 7 - J - 8 - K - 2P start 9 - credit L - 10 - 1P start M - 11 - pump N - 12 - P - left 13 - R - right 14 - down S - 15 - up T - 16 - U - 17 - video ground V - 18 - W - blue 19 - red X - 20 - green Y - 21 - Z - control ground 22 - The 36 VAC is used to derive an internal -29 VDC for the high score table so it is not required for the game to work. For audio amplification I used an LM380 2 watt audio amp chip available from places like Digi-Key for under $1 as follows. Pin C from Dig Dug board to one side of 10 K (volume) pot and the other side of the pot to ground. Center tap of pot to pin 2 (of LM380). Pins 7 & 3 ground. Pin 14 to +12 VDC and .1 uf from pin 14 to ground (decoupling cap). Pin 8 (output) has 2.7 ohm in series with .1 uf to ground to prevent chip from oscillating. Positive end of 250 uF electrolytic to pin 8 also. Negative end of cap to speaker and other speaker connection to ground.

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