NEC POWERMATE 8100 Series, Инструкция по обслуживанию и справочник

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System Board 4-13
Celeron Processor
Intel Celeron processors in the PowerMate 8100 Series come with an internal
clock speed of 300 MHz or 333 MHz. The processor features the Intel
P6-microarchitecture.
The Celeron comes in a single edge processor package (S.E.P.P.), similar to the
single edge contact (S.E.C.) cartridge, and uses a 242-contact slot connector.
The processor technology incorporates 16K level-one caches for instructions
and for data, and has a dedicated 64-bit cache bus. The L2 cache speed scales
with the processor core frequency. The processor has a pipelined Floating-Point
Unit (FPU) to support 32-, 64-, and 80-bit formats. The processor features
parity-protected address/request and response system bus signals with a retry
mechanism.
Pentium III Processor
The Pentium III processor has an internal clock speed of 450 or 500 MHz.
The processor features an optimized 64-bit memory interface and 512 KB of
secondary write-back cache. The processor utilizes the P6 Microarchitecture,
and incorporates 70 new instructions. It runs on the 100 MHz system bus and
incorporates the Intel 440BX chipset.
The Pentium III is geared for latest industry computing needs, including
advanced 3D effects, animation, imaging, video, and speech recognition.
System BIOS
The ISA- and PCI-compatible BIOS is contained in a flash memory device on
the system board. The BIOS provides the Power-On Self-Test (POST), the
system Setup program, a PCI and IDE auto-configuration utility, and BIOS
recovery code.
The system BIOS is always shadowed. Shadowing allows any BIOS routine to
be executed from fast 32-bit DRAM on the system board, instead of from the
slower 8-bit flash device.
NEC’s Flash ROM allows fast, economical BIOS upgrades. The Flash ROM is a
reprogrammable EPROM containing both the system and video BIOS. Using
the Flash ROM to change the ROM BIOS provides the following advantages:
„
the BIOS upgrade is performed quickly and easily
„
the expense of replacing ROM BIOS chips is eliminated, so system
maintenance costs are reduced
„
there is less chance of inadvertently damaging the system board than
when physically replacing ROMs
„
new technology can be incorporated while maintaining corporate
standards
„
network administrators can exercise company-wide control of BIOS
revisions.