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SIMM (Single In-line Memory Module): formerly 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 DIMMs.
Sleep/Suspend mode: in this mode, all devices except the CPU shut down.
SRAM (S
tatic 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 fixed disk drive (usually the HDD) shuts 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
the proper UltraDMA controller, your system cannot take advantage of the higher data transmission rates
of the new UltraDMA/UltraATA HDDs.
USB (U
niversal 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 (V
ideo Graphics Array): the PC video display standard.
V-SYNC: controls the vertical properties of the monitor.
ZIF socket (Z
ero Insertion Force socket): these sockets make it possible to insert CPUs without damag-
ing the sensitive CPU pins. The CPU is lightly placed in an open ZIF socket, and the metal level is pulled
down. This shifts the processor over and down, guiding it into place on the board.