Introduction
3
COM/Xi Boards
The COM/Xi board is actually two boards, the COM/Xi Processor, and an I/O
Mate that plug together to form a unit which occupies a single XT or AT slot
(see Figure 1). The Processor board (or “motherboard”) is common to all
versions of the COM/Xi, and contains a 10 MHz 80C188 microprocessor and
256K of dual-ported RAM. The I/O mate (or “daughter card”) contains the
actual interfacing hardware (communications chips, line drivers and receivers,
connectors, etc) which is unique to the various COM/Xi configurations.
COM/Xi boards are available with I/O Mates to support four or eight RS-232 or
RS-422 asynchronous serial ports. A special version is also available with half
RS-422 and half RS-485 ports.
