Serial Interface; Parallel Port Addressing And Interrupts; Serial Port Addressing And Interrupts - NEC POWERMATE P - SERVICE MANUAL 1996 Service And Reference Manual

Table 1-6 Parallel Port Addressing and Interrupts
Starting I/O Address
378
278
3BC
378
278
3BC
Parallel interface signals are output through the system board's 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 and the IR
interface (see Table 1-7). The buffered high-speed serial ports supports transfer rates up to
19.2 KB. These ports allow the installation of high-speed serial devices for faster data
transfer rates.
I/O addresses and interrupt levels for the two channels are given Table 1-7. The interrupt
level is selectable via Setup to either IRQ3 or IRQ4. Software selectable base addresses are
3F8h, 2F8h, 3E8h, and 2E8h.
Table 1-7 Serial Port Addressing and Interrupts
Starting I/O Address
3F8h
2F8h
3E8h
2E8h
* Disabled if fax/modem installed
** Used for IrDA data transfer
Interrupt Level
IRQ05
IRQ05
IRQ05
IRQ07
IRQ07
IRQ07
NOTE: Any interrupts used for the built-in
serial ports are not available for ISA parallel
ports.
Interrupt Level
IRQ04
IRQ03
IRQ04
IRQ03
Technical Information
Port
LPT1
LPT1 or LPT2
LPT1 or LPT2
LPT1
LPT1 or LPT2
LPT1 or LPT2
Port
COM1*
COM2**
COM3
COM4
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