PCCOM 8-BIT ISA 4-PORT RS-422 (OLD) IO card Settings and Configuration

Card Type	Serial
Chipset	National Semiconductor
I/O Options	Serial ports (4)
Data Bus	8-bit ISA

CONNECTIONS
Function	Label	Function	Label
Serial ports via 40 pin header	CN1	Serial ports via DB-37 connector	CN2
Note:Standard DB-25 serial ports are provided on included adapter cables.

USER CONFIGURABLE SETTINGS
Setting		Label	Position
»	Factory configured - do not alter	J1	Unidentified
»	Bus speed set to 16MHz or lower	JP2	Pins 1 & 3 closed
	Bus speed set higher than 16MHz	JP2	Pins 2 & 4 closed
»	Factory configured - do not alter	SW1/6	Unidentified
»	Factory configured - do not alter	SW1/7	Off
»	Factory configured - do not alter	SW1/8	Unidentified

OPERATING SYSTEM
Setting		SW1/3	SW1/4	SW1/5	U24
»	XENIX mode	Off	Off	On	XENIX PROM
	MS-DOS mode	On	On	Off	MS-DOS PROM

SERIAL PORT ADDRESSES (XENIX)
Port 1		Port 2	Port 3	Port 4	SW1/1	SW1/2
	3F8h (COM1:)	2F8h (COM2:)	2B0h	2B8h	On	On
	3F8h (COM1:)	2F8h (COM2:)	1B0h	1B8h	On	Off
»	2A0h	2A8h	2B0h	2B8h	Off	On
	1A0h	1A8h	1B0h	1B8h	Off	Off

SERIAL PORT ADDRESSES (MS-DOS)
Port 1	Port 2	Port 3	Port 4	SW1/1	SW1/2
3F8h (COM1:)	2F8h (COM2:)	3E8h (COM3:)	2E8h (COM4:)	On	On
280h	288h	290h	298h	On	Off
2F8h (COM2:)	3E8h (COM3:)	2E8h (COM4:)	280h	Off	On
3E8h (COM3:)	2E8h (COM4:)	280h	288h	Off	Off

INTERRUPT (XENIX)
Setting		JP4/A	JP4/B	JP4/C	JP4/D	JP4/E	JP4/F
	IRQ2	Pins 1 & 2	Open	Open	Open	Open	Open
	IRQ3	Open	Pins 1 & 2	Open	Open	Open	Open
	IRQ4	Open	Open	Pins 1 & 2	Open	Open	Open
»	IRQ5	Open	Open	Open	Pins 1 & 2	Open	Open
	IRQ6	Open	Open	Open	Open	Pins 1 & 2	Open
	IRQ7	Open	Open	Open	Open	Open	Pins 1 & 2
Note:Pins designated in closed position.

PORT 1 INTERRUPT (MS-DOS)
Setting	JP3/A	JP3/B	JP3/C	JP3/D	JP3/E	JP3/F
IRQ2	Pins 2 & 3	Open	Open	Open	Open	Open
IRQ3	Open	Pins 2 & 3	Open	Open	Open	Open
IRQ4	Open	Open	Pins 2 & 3	Open	Open	Open
IRQ5	Open	Open	Open	Pins 2 & 3	Open	Open
IRQ6	Open	Open	Open	Open	Pins 2 & 3	Open
IRQ7	Open	Open	Open	Open	Open	Pins 2 & 3
Note:Pins designated are in the closed position.

PORT 2 INTERRUPT (MS-DOS)
Setting	JP3/A	JP3/B	JP3/C	JP3/D	JP3/E	JP3/F
IRQ2	Pins 1 & 2	Open	Open	Open	Open	Open
IRQ3	Open	Pins 1 & 2	Open	Open	Open	Open
IRQ4	Open	Open	Pins 1 & 2	Open	Open	Open
IRQ5	Open	Open	Open	Pins 1 & 2	Open	Open
IRQ6	Open	Open	Open	Open	Pins 1 & 2	Open
IRQ7	Open	Open	Open	Open	Open	Pins 1 & 2
Note:Pins designated are in the closed position.

PORT 3 INTERRUPT (MS-DOS)
Setting	JP4/A	JP4/B	JP4/C	JP4/D	JP4/E	JP4/F
IRQ2	Pins 2 & 3	Open	Open	Open	Open	Open
IRQ3	Open	Pins 2 & 3	Open	Open	Open	Open
IRQ4	Open	Open	Pins 2 & 3	Open	Open	Open
IRQ5	Open	Open	Open	Pins 2 & 3	Open	Open
IRQ6	Open	Open	Open	Open	Pins 2 & 3	Open
IRQ7	Open	Open	Open	Open	Open	Pins 2 & 3
Note:Pins designated are in the closed position.

PORT 4 INTERRUPT (MS-DOS)
Setting	JP4/A	JP4/B	JP4/C	JP4/D	JP4/E	JP4/F
IRQ2	Pins 1 & 2	Open	Open	Open	Open	Open
IRQ3	Open	Pins 1 & 2	Open	Open	Open	Open
IRQ4	Open	Open	Pins 1 & 2	Open	Open	Open
IRQ5	Open	Open	Open	Pins 1 & 2	Open	Open
IRQ6	Open	Open	Open	Open	Pins 1 & 2	Open
IRQ7	Open	Open	Open	Open	Open	Pins 1 & 2
Note:Pins designated are in the closed position.

DIAGNOSTIC LED(S)

The function of the LED is unidentified.