Midway 4-Player 25" Dedicated Video Game manual Sound I/O Board Jumper Position Table

SOUND I/O BOARD JUMPER POSITION TABLE *

Jumper	Location	Function	Meaning	Position	State
J1	Near U9 & Crystal Y3	I/O Connector P2	Input Mode	Pins 1 & 2	■
(Note 1)
			Output Mode	Pins 2 & 3
J2	Between U35 & U10	Video Sync	Positive Sync	Jumper Not	■
				Installed
			Negative Sync	Pins 1 & 2
J3	Near U15	I/O Connector P4	Input Mode	Pins 1 & 2	■
(Note 2)
			Output Mode	Pins 2 & 3
J4	None	None	Not Used	None	---
J5	Between U15 &	I/O Connector P4	Input Mode	Pins 1 & 2	■
(Note 2)	Connector P2
			Output Mode	Pins 2 & 3
J6	None	None	Not Used	None	---
J7	None	None	Not Used	None	---
J8	Between U9 &	I/O Connector P2	Input Mode	Pins 1 & 2	■
(Note 1)	Connector P4
			Output Mode	Pins 2 & 3

Notes

1.Configure I/O port P2 by setting both jumpers J1 and J8 to input or output mode.

2.Configure I/O port P4 by setting both jumpers J3 and J5 to input or output mode.

Wiring 5-12