Sharp PC-1500 - Page 102

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I. HAL TING PROGRAM EXECUTION
STOP, CONT
T he STOP st atement ca uses the comp u ter to suspend t he execution of a progr am. \.Vhe n the
program st ops, th e values of all variables .are ret ained and the p ro gra mme r may i nspect and change
t
he s e. T he program may t hen be continue d, at the poi nt where it was halted. wit h t he CONT
command.
When the STOP sta teme nt is e ncoun te red by the co mp u ter a message simi lar to t he following
is disp l ayed :
[s RE A_ K_ l_N_ 6_ 0
RUN
\vhere 60 is the num ber of th e line which contains t he STOP stat ement.
If you wish to revi ew this l ine . depress and hold tne CD {Up Arrow } ke y .
Wh
en the BREAK messa ge ap pe ars yo u may also review and change the values of variables. For
e xa mp l e:
HQ IE HTER )
___ 5 ~ 23 J
AS IE HT ERI
L "DEDUCT IONS "
Whe ne ver yo u are re ady to resume execution , si mp ly re turn to the pr ompt ( > } and t yp e CONT
EN TER.
J. MODE CONTROL
LOCK, UNLOCK
T he LOCK in S't ruction may be used to control the mode (RUN, PROgram. or RESERVE} in
..... hich the compu ter operates . In cl uded ,..., ithin a pro gram it prevents the user from accidentally
changing the mode and injuring th e program. Th e LOCK ins truct ion disables th e MOOE key,
"l
ocki ng " the com puter into wha te ver mode it is cu rre ntly in .
To re-en ab le the MOOE ke y, the UNLOCK instruc ti on is used. UNLOCK re stores t he norma l
fu nc tioning. allowing chan ge s in mo de .
Ei
ther instru ction may be us ed as a comm and or a statement . T he for ms are simply:
LOCK
UNLOCK
1
00
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