|The PCCOM PCI bus 4 port adapter
is an 32 bits PCI bus board with Plug and Play (PnP) features, it
provides four asynchronous serial
communication ports (RS232 or RS422 or RS485),
which link the computer and serial
peripheral devices such as terminals, modems, serial
printers, plotters, ... etc.
The PCCOM PCI
bus 4 port adapter is particularly suited to facilitate the connection
of terminals (VDUs) in multi-user operating systems. The PCCOM board
may be installed in any Pentium or hardware compatible systems. The PnP
features let hardware configuration for IRQ and I/O address is detected
by BIOS automatically, you don't need set switch and jumper.
Since most of
the computer has its own COM1 and COM2, the PCCOM PCI bus 4 port
adapter can be configured from COM4.
On board ST16C554
chip provides four 16550 functions which contains 16 bytes FIFO buffer
for each 16550 ports. There are two kinds of mode can be choose, one is
normal speed mode that its baud rate up to 115200, another is high
speed mode that its baud rate up to 460K.