Card Configuration

The four port card has two modes of operation. These modes are named Compatible Mode and Enhanced Mode.

In Compatible Mode the first two ports on the multiport card are fixed to the address of COM1 and COM2 respectively (Address 3f8, IRQ 4 and Address 2f8, IRQ 3 respectively). The other two ports share a third IRQ with the base address and IRQ selected by the switch block on the board.

In Enhanced Mode all ports share the same IRQ. The base address and IRQ is selected by the switch block on the board.

WCSC develops and sells all the necessary libraries and DLLs to support this multiport card under the above mentioned operating systems. Contact WCSC at +1 (800) 966-4832 or +1 (281) 498-4832 for additional information, or visit our web site at http://www.wcscnet.com.

Refer to the figures for location of switches/jumpers.

HdwPcom416550_1.GIF (697 bytes)
Figure 1(SW1)

Compatible Mode

In compatible mode, the address and IRQ of the first two ports are fixed. The first port’s address is the standard COM1 (address 3f8, IRQ4). The second port’s address is the standard COM2 (address 2f8, IRQ3). Ports three and four address is determined by SW1-8. Ports three and four IRQ is determine by SW-1 to SW-6.

JP1:	Pins 1 and 3 should be closed for speeds under 16 MHz Pins 2 and 4 should be closed for speeds over 16 MHz
JP2:	Pins 3 and 4 should be closed
JP3:	Pins 2 and 3 should be closed
SW1-1:	On selects IRQ9
SW1-2:	On selects IRQ3
SW1-3:	On selects IRQ4
SW1-4:	On selects IRQ5
SW1-5:	On selects IRQ6
SW1-6:	On selects IRQ7
SW1-7:	On.
SW1-8:	On to set Port1 Address = 3f8 hex Port2 Address = 2f8 hex Port3 Address = 2b0 hex Port4 Address = 2b8 hex Status Register = 2bf hex Off to set Port1 Address = 3f8 hex Port2 Address = 2f8 hex Port3 Address = 1b0 hex Port4 Address = 1b8 hex Status Register = 1bf hex

Enhanced Mode

In enhanced mode, all ports use the same IRQ. The switch settings below details configurations. Note that the Status Register is used under Windows NT to determine which port generated an interrupt.

JP1:	Pins 1 and 3 should be closed for speeds under 16 MHz Pins 2 and 4 should be closed for speeds over 16 MHz
JP2:	No jumpers on.
JP3:	Pins 2 and 3 should be closed
SW1-1:	On selects IRQ9
SW1-2:	On selects IRQ3
SW1-3:	On selects IRQ4
SW1-4:	On selects IRQ5
SW1-5:	On selects IRQ6
SW1-6:	On selects IRQ7
SW1-7:	Off.
SW1-8:	On to set Port1 Address = 2a0 hex Port2 Address = 2a8 hex Port3 Address = 2b0 hex Port4 Address = 2b8 hex Status Register = 2bf hex Off to set Port1 Address = 1a0 hex Port2 Address = 1a8hex Port3 Address = 1b0 hex Port4 Address = 1b8 hex Status Register = 1bf hex

HDWPCOM416550_2.GIF (22270 bytes)