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Format:
To
organ
ize
a new
or
magnetically
(bulk) erased disk-
ette onto
tracks
and sectors. When formatted in single
density,
each
diskette
contains
40
circular tracks, with
18
sectors
per
track,
and in enhanced
density,
40 tracks with 26 sectors per
track.
Each sector can store
up to
128 bytes of
dala.
Hexadecimal or Hex:
Also known as base
16.
Number base
system using
16
alphanumeric characters:
O,1,2,3
,4,5,6,7, 8,9,A,
B,C,D,E,
and
F.
1 /0
:
See
Input.
Indexed Addressing
: See
Random
Accessing
.
INPUT: A BASIC command used
to request
either
numeric
or
string
data from
a specified
device.
Input:
To transfer data
from outside the computer
(say,
from a
diskette
file)
into
RAM
.
Output is the
opposite,
and the two words
are often
used together to describe
data transfer operations
:
Input/Output
or just
1/0.
Note
that
the reference
point is
always
the
computer.
Output
always means
from
the
computer,
while
Input means
into the
computer.
IOCB: Input/Output
Control
Block.
A section of
RAM reserved
for
addressing
an
input
or output device and
processing
data
received from
it
or
for addressing and transferring data
to
an
output device
.
iocb: An arithmetic expression that evaluates to a
number
be-
tween 1
and
7.
This
number
is
used
to refer to a device or
file
.
Kilobyte or
K: 1024
bytes.
16K RAM
is
actually 16 times
1024 or
16,384 bytes.
least Significant Byte
:
The
byte in
the rightmost
or low order
position
in a
number
or a word
.
Machine
language:
The
instruction set for the particular micro-
processor
chip
used
in a
computer.
Most Significant
Byte:
The
byte in the leftmost or
high
order
position
in a number or a
word.
Null String
: A string consisting of no
characters.
For
example,
A$
=
,,"
stores
the null
string
as A$
.
Object Code
:
Machine language derived
from "source
code,"
typically from assembly
language.
122
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