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Disclaimer

The information on the following pages are for information and reference only. By opening a games machine you are voiding any warranty and in addition you can seriously damage your console by altering its circuitry!

All mods on the following pages have been tested although no guarantee or responsibility is implied. If in doubt don't do.

The following table illustrates the pin-out assignments for the SEGA System16 standard.
 
SEGA System16a & 16b 56pin
Component side Back
GND 1 A GND
GND 2 B GND
+5 3 C +5
+5 4 D +5
+12 5 E +12
CoinMeter1 6 F CoinMeter2
_ 7 H _
1p-PUSH 3 8 J 2p-PUSH 3
1p PUSH 2 9 K 2p PUSH 2
1p PUSH 1 10 L 2p PUSH 1
_ 11 M _
1p DOWN 12 N 2p DOWN
1p UP 13 P 2p UP
1p RIGHT 14 R 2p RIGHT
1p LEFT 15 S 2p LEFT
_ 16 T _
_ 17 U _
_ 18 V _
_ 19 W _
COIN 1 20 X 1p START SW
COIN 2 21 Y 2p START SW
TEST SW 22 Z _
SERVICE SW 23 A _
Sreaker (+) 24 B Speaker (-)
Red 25 C Green
Blue 26 D Sync
GND 27 E GND
GND 28 F GND