![background image](http://html.mh-extra.com/html/nec/powermate-466m/powermate-466m_service-manual_248629028.webp)
Technical Information 1-15
Parallel Interface
The system has a 25-pin parallel port on the system board. Specifications for this port con-
form to the IBM-PC standards.
The BIOS has automatic ISA printer port sensing. If the BIOS detects an ISA printer port
mapped to the same address, the built-in printer port is disabled. The BIOS also sets the
first parallel interface port it finds as LPT1 and the second port it finds as LPT2. The inter-
rupt is selected to either IRQ5 or IRQ7 via the Setup and jumper settings.
Interrupt levels for the parallel port are given in Table Section 1-7. Software selectable base
addresses are 3BCh, 378h, and 278h.
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 shown in Appendix A.
NOTE:
Any interrupts used for the built-in par-
allel port is not available for ISA parallel ports.
Table Section 1-7 Parallel Port Addressing and Interrupts
Starting I/O Address
Interrupt Level
Port
378
IRQ05
LPT1
278
IRQ05
LPT1 or LPT2
3BC
IRQ05
LPT1 or LPT2
378*
IRQ07
LPT1
278
IRQ07
LPT1 or LPT2
3BC
IRQ07
LPT1 or LPT2
*Default for parallel port
Summary of Contents for PowerMate 466M
Page 10: ...Contents xiii ...
Page 176: ...Connector Pin Assignments A 15 ...