Radio Shack TRS-80 User Manual page 58

Is
There
No End
to
This Magic?
We now
have 2 separate
programs
resident
in
the
computer.
We know how
to
run the
first
one
—
we
just
typeRUN. To
run
the
second one
we
have
a
foxy
variation
on
RUN
called
RUN
##tt
.
. .
and,
as
you
might
suspect,
it is
similar
to
LIST###. To
RUN
the
program
starting
with
line
10,
type
RUN
10
.
. ,
and
that's just
what happens.
Will
wonders never cease?
If
you
have 20 or 30
programs
in
the
computer
at
the same
time,
you
can
RUN
just
the
one you want, provided you
know
its
starting
line
number.
What's
more, you can
start
any program
in
the middle
(or
elsewhere)
for
purposes of trouble-
shooting
—
a
matter
we
will
become more
involved
in as
our programs
get longer
and more
complicated.
Meanwhile,
Back
at
the
Ranch
We
got
into this
whole messy
business trying to find
a
way
to slow
down
our run
on
the
flight
times
from
Boston
to
San
Diego.
In
the process
we found
out a
lot
more
about
the
Computer
and learned to build a timer loop.
Now
let's see
if
we
can build
a
timer loop into
our
big
program.
First,
let's
erase the
test
program
using
lines 2,
3, 4, 5,
6,
7,
&
9 by
typing
each of those
numbers
followed with
l^
||
^
jjf
.
One way
to
stop the
fast
parade of information
in
our chart
is
to
put
in a
STOP. Type
in
85
IF R
=
600 STOP
...
and
RUN.
We know R
is
going to
increment
to
600,
and
that's
about
half
way
through
the
chart,
so
600
is
a
good
choice. See
how
the chart ran
out
to
550
mph
then
hit the
stop
at
600 came
racing
down
to
line
85.
Your
screen
should read the
first
part of the chart and
BREAK AT
85
This
means
the
program
is
stopped, or
broken
at
line
85.
You
can
now
gaze at the
top
half
of the
chart to
your
heart's content.
To
restart the
program merely type
CONT
56
Again^thfr
##*
s
represent t&e
number
of
ifce
line
you
want the
RUN
to^tart with.
V
'MAGICIAN'