Sharp PC-1500A Instruction Manual page 102

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I. HAL TING PROGRAM EXECUTION
STOP, CONT
The STOP statement causes the computer to suspend the execution of a program. When the
program stops, the values of all variables arc retained and t he programmer rnay inspect and change
these. The program may then be continued, at the point where it was halted. w ith the CONT
command.
When the STOP staternent is encountered by the computer a message similar tto the following
is displayed :
RVN
-- · ~
BREAK IN 60
\Vherc 60 is the number of the l ine which contains the STOP statement .
If you wish to review this line. depress and hold the [D (Up Arrow I key.
When the BR EA K message appears you may also review and change the values oi variables. For
example :
HO
I ENTER I
56.
AS
( ENTER!
Whenever you are ready to resume execution, simply return to the prompt
1> I
and type CONT
ENTER.
J . MODE CONTROL
LOCK, UNLOCK
The LOCK inst<uction may be used to control the mode (RUN, PROgram, or RESERVE! in
which the computer operat es. Included \Vithin a
pro~ram
it prevents the user fr'om accidentally
changing the mode and injuring the program. The LOCK instruction disables 1ho MODE key,
"locking" the computer into whateve r mode it is currently in.
To re-enable the MODE key, the UNLOCK ins'!ruction is used. UNLOCK restores the normal
functioning, allowi ng changes in mode.
Either' instfuction may be used as a command or a statement. The forms are simply:
LOCK
UNLOCK
100
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