Glossary
F-11
F
F
when the system requires frequent BIOS calls. Typically, system and video
BIOS extensions are shadowed in DRAM to increase system performance.
Single In-Line Memory Module (SIMM): A small, rectangular circuit board on
which is mounted semiconductor memory ICs.
Small Outline Dual Inline Memory Module (SO DIMM):
A new form factor for
memory modules that is smaller and denser than SIMMs.
Standoff: A mechanical device, typically constructed of an electrically non-
conductive material, used to fasten a circuit board to the bottom, top, or side
of a protective enclosure.
Static Random Access Memory (SRAM): A semiconductor RAM device in which
the data will remain permanently stored as long as power is applied, without
the need for periodically rewriting the data into memory.
Symmetrically Addressable SIMM: A SIMM, the memory content of which is
configured as two independent banks. Each 16-bit wide bank contains an
equal number of rows and columns and is independently addressable by the
CPU via twin row address strobe registers in the DRAM controller.
SYSCLK: ISAbus System Clock. The ~8.33MHz clock signal present on the ISAbus
to which all bus transactions are synchronized.
System Memory: See Conventional Memory.
T
Terabyte (TB or TByte): Approximately one thousand billion (US) or one billion
(Great Britain) bytes. 2^40 = 1,099,511,627,776 bytes exactly.
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