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Radio Shack Telephone Interface II Manual

Radio Shack Telephone Interface II
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(J
I
1.
What
is
a
program
calculation?
We've
been
discussing
manual
calculation
for
the
last
8
or 10
pages
calculations
performed
by
manual
entry
of
all
information.
Now
let's
find
out
why
your
TRS-80
Pocket
Computer
is
much
more
than
a
Calculator.
With
programmed
calculations
you
enter
a
series
of
instructions
to
the
Computer
(a
program)
Then
all
you
need
do is
enter
the
data for
the
calculation
work
-
the
Computer
uses
the
program
(stored
in
memory)
to give
you
the
answers.
Let's
give
an
example.
When
solving
problems
using
Pythagoras's
theorem,
for
example,
you
must
carry
out
the
follow-
ing
operation.
Pythagora's
theorem
For
a
rectangular
triangle,
its three
sides
a, b
and
c
have
the
following
relations
c
=
Va
2
+b
2
°'
where
c
is
the
side
opposite
to
the
right
angle.
Manual
calculation
requires
the
following
sequence.
(when
a
=
3
and
b
=
4.)
Operation
Set
to
the
RUN
mode.
CA3[=D3(^i
EE[=]4e
ESHrDECBCE
CECBCBCBCT]
[ewterj
j
Display
C=
A(A*A_
C=v^(A*A
+
B*B)_
3.
4.
Note
A
is
loaded
with
3.
B
is
loaded
with
4.
;ahb
2
[The
above
calculation
of
course
can
be
accomplished
by
using:
\T
(3*3
+ 4*4)
S. However,
we're
using
the key
operations
shown
above
to
aid
in
our
application
example.]
Let's
key
in
this
simple
BASIC
program:
[PROGRAM
1]
Program
Note
1
:
I
NPUT
A
>
B
20
:
C=/(A*A +
B*B)
30
:
PR
I NT
C
40
:
END
Input
instruction
Operation
instruction
Output
instruction
End
instruction
i
NOTE:
The
letters
A, B and
C
are
called
variables.
You
might
want
to refer
to
pages
45
to
50
for
a
detailed
description
of
what
variables
are
and
how
they
relate
to
program-
ming.
To
complete
a program line,
you
must press
(enter)
.
32

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Radio Shack Telephone Interface II Specifications

General IconGeneral
BrandRadio Shack
ModelTelephone Interface II
CategoryDesktop
LanguageEnglish

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