SUN3/80 Architecture

JUMPER	PINS	SETTONG	DESCRIPTION
J1000	1-2	OUT	Watchdog reset(test)
J020	1-2	IN	68882 20MHz
	3-4	OUT	68882 40MHz
J043 J044	2-3	IN	RS232C(-12V)
	1-2	IN	RS232C(+12V)
J043 J044	1-2	IN	RS423(-5V)
	2-3	IN	RS423(+5)