Radio Shack Telephone Interface II Manual

m*
PROG
RAM
STA^EMEitrs
In
this
section
we
use
the
following
form
for
various terms,
[variable],
[numerical
variable],
[character
variable]
and
< expression
>
.
[Variable]:
[Numerical
variable]:
[Character
variable]:
<
Expression
>
:
General
name
for
numerical
and
character
variables.
General
name for
fixed
memories
defined
by A
through
Z
and
dimensioned
memories
defined
in
the form
of
A
(
).
General
name
for
fixed
memories
defined
by A$
through
Z$
and
dimen-
sioned
memories
defined
in the
form
of A$
(
).
Operational
expression
composed of elements
of
<
expression
> as we
des-
cribed
on
page
18,
covering
also [numerical
variable]
.
1.
LET
statement
The
variable
name
on the
left
is
assigned the value
of the
constant or
expression
on
the
right.
The
TRS-80
Pocket
Computer
does not
require
LET
except
when it is
used with an
IF
statement.
(For
IF
statement,
consult page
60.)
General
form
(1)
LET
[Numerical
variable]
=<
Expression
>
Example:
LET A
=
5*3
Example:
LET
A= 123
A(30)
=
3*6
A(2*B)
=
C
+
D
Instruction
to
put
123 in A (LET
can
be
omitted as in
the
following
example.)
Instruction
to
put 18 in A
(30).
Instruction
to put the value of C
+
D
in A
(2
*
B).
General
form
(2)
LET
[Chracter
variable]
=
"Character"
Example:
LET
Z$=
"BASIC"
Characters
between
quotation
marks are
put in the character
variable
specified by the
leftside.
When
the
length
of a string
of
characters
on
the
right side
exceeds seven
characters,
only
the first
seven
characters
are
put
in (the
excess
is discarded).
General
form
(3)
LET
[Character
variable]
=
[Character
variable]
Example:
LET A$(25)
=
Z$
Characters
stored
in
the
character
variable
specified
on
the
right side are
placed in the character
variable
specified
by
the left
side.
Example:
A$
=
"NON"
Instruction
to place "NON" in A$.
A$(28)
=
"DATA
?"
Instruction
to place "DATA
?"
in A$(28).
C$
=
A$
Instruction to place characters
stored
in A$
in C$.
•
General
forms
(1)
thru
(3)
can
be
put
on
a
single program
line
by
dividing them with commas
(,).
In this
case, LET
must not be used after
a comma
(
,
).
Example:
10
: LET
A
=
2
'
B
=
7
»
C$
=
"A
=
2,
B
=
7"
2
is placed in
A,
7
in B and "A
=
2,
B
=
7"
in
C$.
51

Radio Shack Telephone Interface II Specifications

General

Brand	Radio Shack
Model	Telephone Interface II
Category	Desktop
Language	English