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Jumper-A rectangular plastic casing (usually black) that
measures approximately .100" x .200" x
.250".
It
fits over two
pins of a jumper block (.100" apart) to make an electrical
connection between them.
Jumper Block-1\vo or more pins side by side protruding from
a circuit board that can be electrically connected with ajumper.
These are used to configure the circuit for different conditions.
Logical Drlve- DOS assigns one or more logical drives to each
physical drive and assigns them a unique alphabetic designator.
Drive A: can be a floppy drive
,
drive B: can be a
RAM
disk,
drive
C: can be the first half of a hard disk drive, drive D: can be the
second half of a hard disk drive,
etc.
MDA- Monochrome Display Adapter. PrOvides TTL output, 80
x 25 text only, 2 colors (monochrome).
Motherboard-The main system circuit board.
Sometimes
referred to as the CPU board or the system unit
board.
Physical Drlve-This is the actual drive itself. A floppy disk drive
itself would be considered one physical
drive.
RAM-Random Access Memory. These are 16 or
18
pin chips
that are part of the computers memory. You can think of this
memory as the computers scratch pad. Once power is turned off
to the computer, the
RAM
contents are
lost.
I
ROM-
Read Only
Memory.
This is memory that can't be changed
(nor would you want
t
o). When power is turned off and back
on,
the data are still
there.
Generally used for BIOS.
SETUP-This is a program (which can be stored in the BIOS ROM
or on a disk) that is necessary to configure the parameters needed
by
the motherboard. Usually found only on AT style computers.
These parameters tell the motherboard upon boot-up the
following information:
time,
date, drive
types,
monitor type
,
m
emory amount and type.
Terminator-Terminating resistor pack. Used in disk drives to
filter out line noise and terminate a data cable. Consists of a row
of 220 to 330 ohm resistors molded together. This is usually
installed in a socket.
It
is removed from all drives except the disk
drive at the end of a DAISY
CHAIN
cable.
17
VGA-Video Graphics Array.
Provides many RGB or Analog
modes up to 800 x 560. Can display 256 colors from a palette of
262,000. Usually can emulate EGA, CGA and HGA.
Warm Boot-To reset the computer without removing power. The
CPU is told to re-initialize itself. The procedure to invoke this is:
Press and hold the
@ill
key down.
Press and hold the @!) key
down.
Press the
~
key down.
Release all three.
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