Radio Shack TRS-80 PC-4 Owner's Manual page 11

Trs-80 pc-4
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ISTOP]
Stop Key
If pressed during program execution, "STOP" will be displayed and program execution
will stop at the end of the line.
During execution trace with "STOP" on the display, this key displays the program
area number and the line numbers.
1m
Execute Key
Press
1m
instead of "=" when the result of a manual calculation is required.
In the "WRT" mode, when writing in a program, press to write (store) each line in
the computer. If this key is not pressed, nothing will be written in.
In the "R UN" mode, press for data input during program execution or to continue
program execution while "STOP" is displayed.
~
Answer Key
In manual calculations, press
~
(answerl to recall the previous calculation result.
I~I
ExponenVPiKey
When inputting exponential values, press
00
after inputting the mantissa portion.
Example:
2.56 x 10
34
-+
[gJ
c:J
(§] [§)
00
(;2)
~
'R
The exponential portion may be a maximum of ±99. If this is exceeded, an error will
occur.
I
~)
Equal Key/Com parison Key
Press
§)
when using a substitution statement or for comparison when using an 1F
statement.
In the Shift In mode, press
EJ
for comparison when using an I F statement.
P7
P8
P9
CZJ[6J~
P4
P5
P6
~~[§]
P1
P2
P3
rn~~
PO
t
~8
Numerical Keys!Program Number Keys
Press when inputting numerical values into the computer. Press
c:J
at the location of the decimal point.
In the Shift In mode,rS3 through
~
become the program number
designation keys and when a program has been written in, the
program will start.
The
d:::.
Key is pressed in the Shift In mode when a power (XYj is
required.
:2
~
>
<
DaDa
Calculation Instruction Keys/Comparison Keys
• When performing addition, subtraction, multiplication and division, press the res-
pective keys.
o
is used for multiplication (corresponds to "x").
a
is used for division (corresponds to +).
In the Shift In mode use these keys for comparison of a judgment in an I F statement.
-8-

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