Radio Shack TRS-80 User Manual page 56

Start
by typing
9
END
We
are
going
to use the
space
in lines
1
through
8
to write
and experiment
with
a
second
little
program,
and want
it
to
END
without plowing ahead
into
the "Flight" program.
The
Egg
Timer
It
takes time
to
do
everything.
Even
this
foxy
box
takes time
to
do
its
thing,
though you
may
be
awed by
its
speed.
Type
this:
1
PRINT "DON'T
GO
AWAY"
2
FOR
X
=
1
TO
5000
3
NEXT
X
5
PRINT
"
TIMER PROGRAM ENDED."
...
and
RUN
How
long did
it
take? Well,
it
did take time,
didn't
it?
About
10 seconds?
The Computer
can do approximately
500
FOR-NEXT
loops per second.
That means, by
specifying the
number
of
loops,
you
can
build in
as
long a time-delay
as
you
wish.
Change
the
program
to
create a
30
-second delay.
Time
it
against
your watch
or clock to see
how
accurate
it
is.
Answer:
2
FOR
x =
1
TO 15000
EXERCISE
11-1: Using the space
in lines 1
through
8,
design
a
program which
asks
you
how many
seconds delay
you
wish, allows
you
to enter a
number, then executes
the delay
and
reports
back
at
the end that the delay
is
over,
and
how many
seconds
it
took,
A
sample
answer
is
in
Part
B.
54
Remember
back
when we
told
you
hot
to
do
this
(number
lines directly in sequence}*?
Well.,,
if
we
hadn't followed
that rule
we wouldn't have
this nice
space
to
demonstrate
the point