CHAPTER 1
INTRODUCTION

The PCCOM 4 port adapter provides four asynchronous serial communication ports (RS232), which link the computer and serial peripheral devices such as terminals, modems, serial printers, plotters, ... etc.

The PCCOM 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 PC/486, Pentium or hardware compatible systems. To accommodate a variety of operating systems, three jumper blocks and one switch permit maximum flexibility of configuration. You may select which interrupt (IRQ2 - IRQ7), I/O address, and interrupt vector you desire.

The PCCOM 4 port adapter can be configured to either compatible mode or enhanced mode. When configured to compatible mode, it takes the place of the standard serial ports (COM1:,COM2:). When configured to enhanced mode, the four ports coexist with standard serial ports.

The PCCOM 4 port board can be used to plug in 8250, 16450, 16550, or 16650 chips, and the PCCOM device driver can detect it automatically. There are two kinds of board can be choose, one is normal speed card that its baud rate up to 115200, another is high speed card that its baud rate up to 460K.