Radio Shack TRS-80 Model III - Page 140

TRS-80
MODEL
III
RUN
line
number
Causes
Computer
to execute
the
program
stored in
memory.
If no line
number
is
specified,
execution
begins
with
lowest
numbered
program
line. If
a line
number is
specified,
execution
begins
with
the line
number.
(Error
occurs if
you specify
an
unused
line
number.
)
Whenever
RUN
is executed
, Computer also
executes
a
CLEAR.
Examples:
RUN
Execution
begins
at
lowest-numbered
line
RUN
1
00
Execution
begins
at line 1
00
RUN
may
be
used
inside
a program
as a statement;
it is
a convenient
way
of
starting
over
with
a clean
slate for
continuous-loop
programs
such
as games.
To
execute
a program
without
CLEARing
variables
, use
GOTO.
SYSTEM
Puts
the
Computer
in
the
System
Mode, which
allows
you
to
load
object
files
(machine-language
routines
or
data).
Radio Shack
offers
several
machine-language
software
packages,
such
as the
Editor-Assembler.
You
can
also
create
your own
object files
using
the
TRS-80
Editor/
Assembler.
To load
an
object file:
Type
SYSTEM
and
(ENTER)
will
be
displayed.
Now
enter
the file
name
(no
quotes
are
necessary)
and
the
tape
will
begin
loading.
During
the
tape
load,
the
familiar
asterisks
will
flash
in
the
upper
right-hand
corner
of
the Video
Display
.
When
loading
is
complete,
another
will
be
displayed.
Type
in
a
slash-symbol
/ followed
by
the
address
(in
decimal
form)
at which
you wish
execution
to
begin.
Or
you may
simply
type in
the
slash-symbol
and
(ENTER)
without
any
address.
In
this
case
execution
will
begin
at
the
address
specified
by
the
object
file.
NOTE:
BASIC
object
files
are
stored
as blocks.
Further,
each
block
has
its
own
check
sum.
Should
a check
sum
error
occur
while
loading,
the
leftmost
asterisk
will
change
into the
letter
C
.
If
this
occurs
you will have
to reload
the entire
object
file
.
(If
the
tape motion
doesn't
stop,
hold
down
(BREAK)
until
READY
returns.)
See
"Using
the
Cassette
Interface'
'
in
the
Operation
Section
for
information
on
which
baud
rate
to use
and the
procedures
for
loading
a system
tape.
130