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SIMM
Single Inline Memory Module. A small circuit board that can hold a
group of memory chips. Typically, SIMMs hold up to nine RAM
chips. On PCs, the ninth chip is for parity error checking. Unlike
memory chips, SIMMs are measured in bytes rather than bits. In
today's SIMMs, each chip holds 2 MB, so a single SIMM holds 16
MB. SIMMs are easier to install than individual memory chips. The
bus from a SIMM to the actual memory chips is 32 bits wide. A
newer technology, called dual in-line memory module (DIMM),
provides a 64-bit bus. To take advantage of the 64-bit bus on Pentium
II processors, you need to use either DIMMs or pairs of SIMMs. See
DIMMs.
Slot 1
The form factor for Intel Pentium II processors. The Slot 1 package
replaces the Socket 7 and Socket 8 form factors used by previous
Pentium processors. Slot 1 is a 242-pin daughter card slot that accepts
a microprocessor packaged as a Single Edge Contact (SEC) cartridge.
A system board can have one or two Slot 1s. See SEC.
SMART
Self-Monitoring Analysis and Reporting Technology. A hard drive
feature that works in conjunction with system software (for example,
LANDesk Client Manager, NEC Auto Backup) for identifying a
potential problem on the hard drive and automatically backing up
system files to a user-specified device, such as a tape or Zip drive.
sound card
An expansion card designed for sound input and output. Sound cards
can record and play back digital audio. Most also have a MIDI
synthesizer, which means they can play MIDI files; some also have
MIDI inputs and outputs.
super video graphics array (SVGA)
A color bit-mapped graphics display standard, that provides a
resolution of 1024x 768 with up to 256 colors displayed
simultaneously.
synchronous
Refers to protocols that require the clocks of the communicating
machines to be coordinated.
Glossary 19
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