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1-16 Technical Information
Serial Interface
The system has two standard serial ports (COM1 and COM2). The serial ports support the
standard RS-232C interface (16550 compatible). I/O addresses and interrupt levels for the
two channels are given in Table Section 1-8. The interrupt is selectable via Setup to either
IRQ3 or IRQ4. Software selectable base addresses are 3F8h, 2F8h, 3E8h, and 2E8h. Serial
interface signals are output through the system board's 9-pin, D-subconnector. The con-
nectors are located at the rear of the system unit. Pin locations for the serial interface con-
nector are shown in Appendix A
NOTE:
Any interrupts used for the built-in serial
ports are not available for ISA parallel ports.
Table Section 1-8 Serial Port Addressing and Interrupts
Starting I/O Address
Interrupt Level
Port
3F8
IRQ04
COM1
2F8*
IRQ03
COM2
3E8
IRQ04
COM3
2E8
IRQ03
COM4
*Default for serial port
Serial interface specifications include:
n
Baud rate up to 19.2 KB per second
n
Word length - 5, 6, 7, or 8 bits
n
Stop bit - 1, 1.5, or 2 bits
n
Start bit - 1 bit
n
Parity bit - 1 bit (odd parity or even parity).
Indicator Panel
The indicator panel is attached to the front panel and contains the power lamp, hard disk
drive busy lamp, and reset button. The indicator panel attaches to the system board using
connector P5 (reset connector), P7 (hard disk drive busy lamp connector), and P15 (power
lamp connector).
Содержание PowerMate 466M
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