Card Configuration

Jumper settings should be set based on the following descriptions. Refer to Figure 5 for the location of jumpers on the multiport card.

Figure 1(JP1, JP2)

JP1 and JP2 are used to set the port address of each UART.

EN must be open to enable the port. If the jumper is on, then the port is disabled.

A9 through A3 is used to select the address of the port. They represent the upper 7 bits of the address. A2 through A0 are zero and require no jumpers. Jumper on(shorted) represents a logical zero. Jumper off(open) represents a logical one. Following is an example of how the addresses are computed.
Figure 1 is configured for address 2A0 hexadecimal. It was computed as follows.
Convert to binary
 HEX    	2	A	0
 Binary		0010	1010	0000
Get rid of the lower three bits and the upper 2 bits. This leaves only A9 through A3.

1010100

Noting that the jumper should be opened(no jumper) for a logical one, and closed for a logical zero(jumpered) the jumper settings should be:

Jumper must be on (shorted) for A8, A6, A4, & A3
Jumper must be off(opened) for A9, A7, A5

Figure 2(JP4, JP5)

JP4 & JP5 select the interrupt that each port will use. Note that any port can use any interrupt. Some or all may be shared. Figure 2 shows all ports using IRQ 11.

Figure 3(JP3)

JP3 selects which interrupt are being used by the ports. (e.g. If port1 uses IRQ5 and port 2 uses IRQ11, then jumpers 5 and 11 on JP3 should be jumpered).

JP6 is used to select wait states. It selects from 1 to 4 wait states.

Figure 5