Pc Cardsfor Isa Bus Systems - W&T Electronics SW 1.9 Manual

W&T
Configuring the card
The base address and the required interrupt line can be set by
DIP switches at the lower edge of the card.
SW1
SW2
Base addresses
The I/O base addresses of the two ports can be set indepen-
dently by DIP switches to 03F8H, 02F8H, 03E8H or 02E8H.
Serial ports at these base addresses are recognized by almost
all modern BIOS versions upon startup of the PC, and are
written to the BIOS RAM of the computer. Some older BIOS
versions recognize only two serial ports at the base addresses
for COM1 and COM2. In these rare cases, a separate program is
needed to search the computer for installed serial ports and
write the COM3 and COM4 ports to BIOS RAM. The necessary
software can be obtained from W&T on request. Setting both
ports to the same base address should be strictly avoided.
40
Port 1
Port 2
20V8
12
1
PC cards for ISA bus systems
7
6