TWINCOM PROFESSIONAL IO card Settings and Configuration

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

CONNECTIONS
Purpose	Location	Purpose	Location
10-pin serial port interface	JP2	25-pin serial port connector	S1

SERIAL PORT 1 CONFIGURATION
COM		JP3/A	JP3/B	JP3/C	JP3/D
»	COM1 (3F8h-3FFh)	Pins 1 & 2 closed	Open	Open	Open
	COM2 (2F8h-2FFh)	Open	Pins 1 & 2 closed	Open	Open
	COM3 (3E8h-3EFh)	Open	Open	Pins 1 & 2 closed	Open
	COM4 (2E8h-2EFh)	Open	Open	Open	Pins 1 & 2 closed
	Disabled	Open	Open	Open	Open

SERIAL PORT 1 INTERRUPT SELECTION
IRQ		JP4/A	JP4/B	JP4/C	JP4/D
»	4	PIns 1 & 2 closed	Open	Open	Open
	2/9	Pins 2 & 3 closed	Open	Open	Open
	3	Open	Pins 2 & 3 closed	Open	Open
	5	Open	Pins 1 & 2 closed	Open	Open
	Disabled	Open	Open	Open	Open

SERIAL PORT 2 CONFIGURATION
COM		JP3/A	JP3/B	JP3/C	JP3/D
»	Disabled	Open	Open	Open	Open
	COM1 (3F8h-3FFh)	Pins 2 & 3 closed	Open	Open	Open
	COM2 (2F8h-2FFh)	Open	Pins 2 & 3 closed	Open	Open
	COM3 (3E8h-3EFh)	Open	Open	Pins 2 & 3 closed	Open
	COM4 (2E8h-2EFh)	Open	Open	Open	Pins 2 & 3 closed

SERIAL PORT 2 INTERRUPT SELECTION
IRQ		JP4/A	JP4/B	JP4/C	JP4/D
»	Disabled	Open	Open	Open	Open
	2/9	Open	Open	Pins 2 & 3 closed	Open
	3	Open	Open	Open	Pins 2 & 3 closed
	4	Open	Open	Pins 1 & 2 closed	Open
	5	Open	Open	Open	Pins 1 & 2 closed

SERIAL PORT 2 ACTIVATION
Chip	Socket
16550	U2
1488	U4
1489	U6
Note: To activate serial port 2 upgrade chips must be installed.