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Appendices
PC-1600 or PC-2100 DDR SDRAM
PC-1600 DDR SDRAM with a 64-bit data bus doubles the data trans-
fer rate of PC100 SDRAM and hence provides data transfer band-
width up to 100x64/8x2=1600MB/s. PC2100 DDR SDRAM doubles
the data transfer rate of PC-133 and hence provides data transfer band-
width up to 133x64/8x2=2100MB/s.
PCI (Peripheral Component Interface) Bus
A high speed data channel for the internal connection of peripheral
devices and the computer system through a PCI expansion card.
PnP (Plug and Play)
The PnP specification suggests a standard register interface for both
BIOS and operating system (such as Windows 95). These registers are
used by BIOS and operating system to configure system resource and
prevent any conflicts. PnP BIOS or operating system will automati-
cally allocate the IRQ/DMA/Memory. Currently, almost all the PCI
cards and most ISA cards are already PnP compliant.
POST (Power-On Self Test)
The BIOS self-test procedure after power-on. It is generally the first
or the second program shown on your monitor screen during system
boot.
RAID (Redundant Array of Independent Disks)
A group of hard disks set up in PC system for data fault tolerance and
better performance. RAID is usually more used in servers than in per-
sonal computers. Different level of RAID stands for different func-
tion and performance:
Level 0 provides data striping or spreading out blocks of files across
multiple disks, and so improvement of performance but no fault
tolerance.
Level 1 provides disk mirroring, and so data backup.
Level 3 provides a dedicated disk for error correction of data, and so
better performance and some fault tolerance.
RAS (Row Address Strobe)
RAS is a technology that DRAM writes and reads to the Row addresses,
while a CAS (Column Address Strobe) signal is used to validate the
column address. The signals are generally sent CAS before RAS.
(in Network field, RAS stands for Remote Access Services).
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