Serial Interface - NEC POWERMATE ENTERPRISE NETPC Service Manual

Parallel interface signals are output through the system board 25-pin, D-subconnector. The
connector is located at the rear of the system unit. Pin locations for the parallel interface
connector are given in Appendix A.

Serial Interface

The system has two 16C550 UART compatible serial ports (COM1 and COM2) integrated
on the I/O controller. The serial ports support the standard RS-232C interface. The buffered
high-speed serial ports support transfer rates up to 115.2 KB. These ports allow the
installation of high-speed serial devices for faster data transfer rates.
Sets of I/O addresses and interrupt levels for the two channels are given in Table 1-9 and
Table 1-10. (Note that COM2 is disabled by default.) The interrupt levels are selectable via
the Setup utility and include IRQ3 and IRQ4. Software selectable base addresses are 3F8h,
2F8h, 3E8h, and 2E8h. If serial ports are reconfigured to share an interrupt, verify that the
software and hardware added by users can share interrupts without problems.
NOTE: Any interrupts used for the built-in
parallel port are not available for ISA parallel
ports.
Technical Information 1-17