Plug And Play; Isa Bus; Pci Local Bus - NEC POWERMATE PROFESSIONAL - SERVICE MANUAL 05-1997 Service Manual

1-12 Technical Information
Interrupt Priority
IRQ10*
IRQ11*
IRQ12
IRQ13
IRQ14
IRQ15
*These interrupts are selected and used by the installed expansion boards.

Plug and Play

The system comes with a Plug and Play BIOS that supports Plug and Play technology. Plug
and Play eliminates complicated setup procedures for installing Plug and Play expansion
boards. With Plug and Play, adding a Plug and Play expansion board is done by turning off
the system, installing the board, and turning on the system. There are no jumpers to set and
no system resource conflicts to resolve. Plug and Play automatically configures the board.

ISA Bus

The system board uses the ISA bus for transferring data between the processor and I/O
peripherals and expansion boards. The ISA bus supports 16-bit data transfers and typically
operates at 8 MHz. ISA expansion slot connector pin assignments are provided in
Appendix A.

PCI Local Bus

The 32-bit PCI-bus is the primary I/O bus for the system. The PCI-bus is a highly integrated
I/O interface that offers the highest performance local bus available for the Pentium II
processor. The bus supports burst modes that send large chunks of data across the bus,
allowing fast displays of high-resolution images.
The high-bandwidth PCI-bus eliminates the data bottleneck found in traditional systems,
maintains maximum performance at high clock speeds, and provides a clear upgrade path to
future technologies.
PCI expansion slot connector pin assignments are provided in Appendix A.
Table 1-5 Interrupt Level Assignments
Interrupt Device
USB (SCSI board for SCSI configurations)
Video Board
Onboard mouse port (available if no PS/2 mouse)
Reserved, Math Coprocessor
Primary IDE
Secondary IDE if present, or else user-available