422/485PC-20/DB25 IO card Settings and Configuration

Card Type	Serial card
Chip Set	Unidentified
Maximum Onboard Memory	N/A
I/O Options	Serial ports (2)
Data Bus	16-bit ISA
Floppy drives supported	N/A

CONNECTIONS
Function	Label
37-pin serial port connector	CN1

SERIAL PORT ADDRESS CONFIGURATION
Serial port 1		Serial port 2	J7/A	J7/B	J7/C	J7/D
»	COM1 (3F8h)	COM2 (2F8h)	Closed	Closed	Open	Open
	COM2 (2F8h)	COM3 (3E8h)	Open	Closed	Closed	Open
	COM3 (3E8h)	COM4 (2E8h)	Open	Open	Closed	Closed
	COM1 (3F8h)	N/A	Closed	Open	Open	Open
	COM2 (2F8h)	N/A	Open	Closed	Open	Open
	COM3 (3E8h)	N/A	Open	Open	Closed	Open
	COM4 (2E8h)	N/A	Open	Open	Open	Closed
	Disabled	Open	Open	Open	Open	Open

SERIAL PORT 1 INTERRUPT SELECTION
IRQ		SP1/A	SP1/B	SP1/C	SP1/D	SP1/E	SP1/F
	2/9	Closed	Open	Open	Open	Open	Open
	3	Open	Closed	Open	Open	Open	Open
»	4	Open	Open	Closed	Open	Open	Open
	5	Open	Open	Open	Closed	Open	Open
	6	Open	Open	Open	Open	Closed	Open
	7	Open	Open	Open	Open	Open	Closed
	10	Open	Open	Open	Open	Open	Open
	11	Open	Open	Open	Open	Open	Open
	12	Open	Open	Open	Open	Open	Open
	14	Open	Open	Open	Open	Open	Open
	15	Open	Open	Open	Open	Open	Open

SERIAL PORT 1 INTERRUPT SELECTION (CON’T)
IRQ		SP1/G	SP1/H	SP1/I	SP1/J	SP1/K
	2/9	Open	Open	Open	Open	Open
	3	Open	Open	Open	Open	Open
»	4	Open	Open	Open	Open	Open
	5	Open	Open	Open	Open	Open
	6	Open	Open	Open	Open	Open
	7	Open	Open	Open	Open	Open
	10	Closed	Open	Open	Open	Open
	11	Open	Closed	Open	Open	Open
	12	Open	Open	Closed	Open	Open
	14	Open	Open	Open	Closed	Open
	15	Open	Open	Open	Open	Closed

SERIAL PORT 2 INTERRUPT SELECTION
IRQ		SP2/A	SP2/B	SP2/C	SP2/D	SP2/E	SP2/F
	2/9	Closed	Open	Open	Open	Open	Open
»	3	Open	Closed	Open	Open	Open	Open
	4	Open	Open	Closed	Open	Open	Open
	5	Open	Open	Open	Closed	Open	Open
	6	Open	Open	Open	Open	Closed	Open
	7	Open	Open	Open	Open	Open	Closed
	10	Open	Open	Open	Open	Open	Open
	11	Open	Open	Open	Open	Open	Open
	12	Open	Open	Open	Open	Open	Open
	14	Open	Open	Open	Open	Open	Open
	15	Open	Open	Open	Open	Open	Open

SERIAL PORT 2 INTERRUPT SELECTION (CON’T)
IRQ		SP2/G	SP2/H	SP2/I	SP2/J	SP2/K
	2/9	Open	Open	Open	Open	Open
»	3	Open	Open	Open	Open	Open
	4	Open	Open	Open	Open	Open
	5	Open	Open	Open	Open	Open
	6	Open	Open	Open	Open	Open
	7	Open	Open	Open	Open	Open
	10	Closed	Open	Open	Open	Open
	11	Open	Closed	Open	Open	Open
	12	Open	Open	Closed	Open	Open
	14	Open	Open	Open	Closed	Open
	15	Open	Open	Open	Open	Closed

MISCELLANEOUS TECHNICAL NOTE

Note: CN1 is a DB-37 connector which has two DB-25 (port 1 & 2) serial ports connected.