NEC PowerMate 2000 Series, Service And Reference Manual, Page: 102 / 175

4-10 System Board
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there is less chance of inadvertently damaging the system board than
when physically replacing ROMs
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new technology can be incorporated while maintaining corporate
standards
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network administrators can exercise company-wide control of BIOS
revisions.
The BIOS programs execute the Power-On Self-Test, initialize processor
controllers, and interact with the display, diskette drive, hard drive,
communication devices, and peripherals. The system BIOS also contains the
Setup utility. The POST copies the ROM BIOS into RAM (shadowing) for
maximum performance.
The Flash ROM allows the system and video BIOS to be upgraded with the
BIOS Update utility, without having to physically remove the ROM (see
Section 2 for further information on the BIOS Update utility). The Flash ROM
supports the reprogramming of the system BIOS and the video BIOS.
System Memory
The system comes with between 64 MB and 256 MB of SDRAM installed in
SO-DIMM sockets on the system board.
The memory configuration consists of two sockets. The SO-DIMM sockets
accept 168-pin, 64-bit (non-ECC) 64- and 128-MB SO-DIMMs. See
“SO-DIMM Sockets” for a list of supported SO-DIMMs.
PCI Local Bus
The 32-bit PCI local 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 Celeron processor. The bus supports burst modes that send
large amounts of data across the bus, allowing fast displays of high-resolution
images.
The PCI local bus is a high-performance bus that provides a processor-
independent data path between the CPU and high-speed peripherals. The PCI
bus is a robust interconnect mechanism designed specifically to accommodate
multiple high performance peripherals for graphics and full motion video.
The PCI local bus supports memory transfer rates of over 100 MB per second
for reads and over 120 MB per second for writes, depending on processor
configuration.