Processor And Secondary Cache; System Board Feature Components - NEC PowerMate Pro150 Series Service Manual

1-4 Technical Information
Table 1-1 lists the major chips on the system board. See Appendix A, "Connector Pin
Assignments", for a list of the system board connectors. See Appendix B, "System Board
Settings", for a description of board switches.
Table 1-1 System Board Feature Components
Chip
Pentium Chip
82450 PCI/IDE Interface
PC87306B I/O Controller

Processor and Secondary Cache

The PowerMate Pro150 uses a 150-MHz Pentium processor with internal speed of 150
MHz and external speed of 60 MHz:
Each processor has 16 KB of write-back primary cache and a math coprocessor. The 16 KB
primary cache provides 8 KB for instructions and 8 KB for data.
The processor is an advanced pipelined 32-bit addressing, 64-bit data processor designed to
optimize multitasking operating systems. The 64-bit registers and data paths support 64-bit
addresses and data types.
To use the Pentium processor's power, the system features an optimized 64-bit memory
interface and 256 KB of secondary write-back cache incorporated into the processor.
The processor is compatible with 8-, 16-, and 32-bit software written for the Intel386™,
Intel486™, and Pentium processors. The Pentium processor is mounted into a socket-8
zero insertion force (ZIF) socket. The socket provides an upgrade path to the next
generation processor.
Function
150/60-MHz Intel Pentium Pro processor
Up to four PCI/IDE devices
Mode 3 and mode 4 support
Logical block addressing (LBA) of hard disk
drives larger than 528 MB
Extended cylinder Head Sector (ECHS)
translation modes
ATAPI devices
Multimode parallel port
Centronics compatible (standard mode)
Enhanced capabilities port (ECP)
Enhanced parallel port (EPP)
Two RS-232C serial ports
integrated real-time clock + 13 minutes
A 242-byte battery-backed CMOS RAM
integrated 8042 keyboard controller
Flexible IRQ and DMA mapping to support
Windows 95
Support for IrDA-compatible infrared interface.
Supports industry-standard floppy controller