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SCSI Interrupt Steering Logic (SISL): Architecture that allows a RAID controller, such as
AcceleRAID 150, 200 or 250, to implement RAID on a system board -embedded SCSI bus or a set
of SCSI busses. SISL: SCSI Interrupt Steering Logic ( LSI ) (only on LSI SCSI boards)
SIMM (Single In-line Memory Module): formally the most common form of RAM for
motherboards. They must be installed in pairs, and do not have the carrying capacity or the speed
of DIMM modules.
Sleep/Suspend mode: in this mode, all devices except the CPU shut down.
SDRAM (Static RAM): unlike DRAM, this type of RAM does not need to be refreshed in order to
prevent data loss. Thus, it is faster and more expensive.
Standby mode: in this mode, the video and hard drives shut down; all other devices continue to
operate normally.
Striping: see RAID
UltraDMA-33/66/100: a fast version of the old DMA channel. UltraDMA is also called UltraATA.
Without proper UltraDMA controller, your system cannot take advantage of higher data transfer
rates of the new UltraDMA/UltraATA hard drives.
USB (Universal Serial Bus): a versatile port. This one port type can function as a serial, parallel,
mouse, keyboard or joystick port. It is fast enough to support video transfer, and is capable of
supporting up to 127 daisy-chained peripheral devices.
VGA (Video Graphics Array): the PC video display standard
V-SYNC: controls the vertical scanning properties of the monitor.
Wake O n LAN (WOL): A remote wake-up technology that enables you to remotely power
systems "on" for off-hours maintenance. A result of the Intel-IBM Advanced Manageability Alliance
and part of the Wired for Management Baseline Specification, this technology helps save time on
automated software installations, upgrades, disk backups and virus scans. Equally important, it
increases end -user productivity by moving such planned disruptions to off-hours.
Watch Dogtimer (WDT): A device that performs a specific operation after a certain period of time
if something goes wrong with an electronic system and the system doesn't recover on its own.
The WDT contains a digital counter that counts down to zero at a constant speed from a preset
number. The counter speed is kept c onstant by a clock circuit. If the counter reaches zero before
the computer recovers, a signal is sent to designated circuits to perform the desired action, e.g.
reset the system. A normally functioning system must re -load the WDT occasionally, to prevent
the counter from reaching zero.
ZCR: Zero Channel RAID. PCI card that allows a RAID card to use the onboard SCSI chip, thus
lowering cost of RAID solution
ZIF Socket (Zero Insertion Force socket): these sockets make it possible to insert CPUs without
damaging the sensitive CPU pins. The CPU is lightly placed in an open ZIF socket, and a lever is
pulled down. This shift the processor over and down, guiding into the board and locking it into
place.
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