Card Type	Multi I/O
Chipset/Controller	NS16550AN
I/O Options	Serial ports (2)
Maximum DRAM	N/A

CONNECTIONS
Purpose	Location	Purpose	Location
Serial port 1	J2	Serial port 2	J1

SERIAL PORT CONFIGURATION
Port 1(J2)		Port 2 (J1)	SW2/1	SW2/2
»	COM1	COM2	Off	Off
	COM1	Disabled	On	Off
	COM2	COM3	Off	On
	COM3	COM4	On	On

SERIAL PORT INTERRUPT SELECT
Port 1(J2)		Port 2 (J1)	SW2/3	SW2/4	SW2/5	SW2/6
»	IRQ4	IRQ3	On	Off	Off	On
	IRQ3	IRQ4	Off	On	On	Off
	Disabled	Disabled	Off	Off	Off	Off

DMA SELECT
Port 1 (J1)	Port 2 (J2)	SW1/1	SW1/2	SW1/3	SW1/4	SW1/5	SW1/6	SW1/7	SW1/8
Receiver	Receiver	On	On	Off	Off	On	On	Off	Off
Transmitter	Transmitter	Off	Off	On	On	Off	Off	On	On

DMA PORT AND CHANNEL CONFIGURATION
Port 1 (J1)	Port 2 (J2)	JP1	JP2	JP11	JP12
DMA 1	DMA 3	Closed	Closed	Open	Open
DMA 3	N/A	Open	Closed	Closed	Closed
DMA 1	N/A	Closed	Open	Open	Open
N/A	DMA 1	Closed	Open	Closed	Closed
N/A	DMA 3	Open	Closed	Open	Open

RS-422/RS-232 INTERFACE SELECT
Port 1 (J1)		Port 2 (J2)	JP8/A-J	JP9/A-J
»	RS-422	RS-422	Pins 1 & 2 closed	Pins 1 & 2 closed
	RS-422	RS-232	Pins 1 & 2 closed	Pins 2 & 3 closed
	RS-232	RS-422	Pins 2 & 3 closed	Pins 1 & 2 closed
	RS-232	RS-232	Pins 2 & 3 closed	Pins 2 & 3 closed

RS-422 DRIVER SELECT
Port 1 (J1)		Port 2 (J2)	JP5	JP3
»	Always on	Always on	Open	Open
	Always Off	Always Off	Pins 2 & 3 closed	Pins 2 & 3 closed
	Controlled by RTS	Controlled by RTS	Pins 1 & 2 closed	Pins 1 & 2 closed

RS-232/RS-422 NORMAL SET SELECT
Port 1 (J1)		Port 2 (J2)	JP6	JP4
»	RS-422	RS--422	Pins 2 & 3, 4 & 5 closed	Pins 2 & 3, 4 & 5 closed
	RS-422	RS-232	Pins 2 & 3, 4 & 5 closed	Pins 1 & 2, 5 & 6 closed
	RS-232	RS-422	Pins 1 & 2, 5 & 6 closed	Pins 2 & 3, 4 & 5 closed
	RS-232	RS-232	Pins 1 & 2, 5 & 6 closed	Pins 1 & 2, 5 & 6 closed

CLOCK SPEED SELECT
Speed		JP7
»	1.8432MHz	Pins 1 & 2 closed
	8.00MHz	Pins 2 & 3 closed

SIGNAL GROUND CONFIGURATION
Setting		JP10
»	Connected	Closed
	Isolated	Open