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bit, a parallel port send an entire byte. A parallel connection has one drawback.
GLOSSARY
PCI Bus (Peripheral Component Interconnect) – It is a connection slot in a motherboard
that supports 32-bit bus transfer rates. The now standard PCI Local Bus carries data along at least
32 lines, that is, at least 32 bits at a time. Local bus computer designs add special buses so the
CPU can communicate directly with key components like the monitor, resulting in much better
performance. You should look for PCI local bus capabilities in any system you buy, especially PCI
local bus video (which helps the monitor display more quickly).
POST (Power-On Self-Test) – is the first thing your PC does when you turn it on, and
it's your first warning of trouble with any of the components. When the POST detects
an error from the display, memory, keyboard, or other basic components, it produces
an error warning in the form of a message on your display and — in case your display is
part of the problem — in the form of a series of beeps.
RAM (Random Access Memory) – consists of a bank of chips that act as " working
memory ", holding program instructions and data only while your computer's on.
Unless the instructions and data are saved to a disk, RAM forgets them when you turn
your computer off.
RAM is measured in megabytes (M).
Most computers today
come with 32M of RAM, though some sell with only 16M installed. There are a few
different flavors and speeds of RAM, as well. One of the most prominent today is
Extended Data Output ( EDO ) RAM, but an even faster type of RAM that has just hit
the market is called SyncDRAM .
Serial port – Serial ports are also sometimes called COM (short for COMmunications)
ports, and are labeled COM1 , COM2 , and so on. It is simple in concept: one line to
send data, another line to receive data, and a few other lines to regulate how data is
sent over the other two lines – from commonplace modems and printers to plotters and
burglar alarms. The most common use for serial port is with a mouse or modem .
The reason for this is that a serial port is not a very efficient way to transfer data, so
little data that speed is not crucial, and perfect for modems because. With current
technology, phone lines cannot transport more than one signal at a time anyway. The
serial port is often referred to as an RS-232 port .
SCSI (Small Computer System Interface) – An intelligent bus for transmitting data commands
between a variety of devices. There are many implementations of SCSI, including Fast SCSI, Wide
AP-545V/58
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