Radio Shack TRS-80 Model III - Page 259

APPENDIX
machine
language
The
Z-80A
instruction
set,
usually
specified in
hexadecimal
code. All
higher-
level
languages
must be
translated
into
machine-language,
or
interpreted by
machine
language, in
order to be
executed by
the
Computer.
null
string A
string which
has
a
length
of zero.
For
example, the
assignment A$
=
"
"
makes
AS
a
null string.
object code
Machine
language
derived
from
"source code"
,
typically,
from
assembly
language.
octal
Capable
of existing
in one
of eight
states, for
example,
the octal
digits are
0,
1
,
...
,7.
Octal
(base-8)
numbers
are sequences
of
octal
digits. Address
and byte
values are
frequently given
in octal
form.
Under
Model III BASIC,
an
octal
constant
can
be
input by
prefixing the
octal
number with
the
symbol &0.
output
To
transfer
data from
inside the
Computer'
s
memory to
some
external
area, e
.g.
, a
disk file
or a line
printer.
parameter
Information
supplied
with a
command
to
specify how the
command is
to operate.
prompt
A
character
or
message
provided
by a
program to
indicate that
it's
ready to
accept
keyboard input.
random
access
memory
or RAM
Semiconductor
memory which
can be
addressed
directly
and either
read
from or
written to.
routine A
sequence
of
instructions
to carry
out a
certain
function;
typically
,
a
routine called
from
multiple
points
in a
program.
statement
A
complete
instruction in
BASIC
.
string
Any
sequence of
characters
which
must be
examined
verbatim for
meaning:
in other
words, the
string
does not
correspond
to a
quantity.
For
example, the
number 1234
represents
the
same
quantity as
1000+234,
but the
string
"1234"
does not.
(String
addition is
actually
concatenation,
or
stringing-together,
so that:
"1234"
equals
"1"
+
"2"
+
"3"
+ "A").
syntax The
"grammatical"
requirements
for a
command
or
statement.
Syntax
generally
refers to
punctuation
and
ordering
of
elements
within a
statement.
transfer address
See
entry
point.
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