Radio Shack TRS-80 model III Owner's Manual page 120

DISK BASIC
load
without
the
R
option
clears
all
variables
and
closes
all
open
files,
load
with the
R
option
clears
all
variables but does not close
the
open
files.
load
with
the
r
option
is
equivalent
to
the
command
run
exp$,R. Either of
these
commands
can be used
inside
programs
to
allow
program
chaining
—
one
program
calling another,
etc.
Example
L0AD
M
PR0G1/BAS:2
M
Clears resident
basic
program and
loads
progi/bas from
Drive
2;
returns to
basic
command
mode.
MERGE
Merge
Disk
Program
with Resident
Program
MERGE
i
&$$
if
1W
^gelfication
for
an
Ascii-format basic disk
file,
eg., a
program
merge
is
similar to
load
—
except
that the resident
program
is
not erased before
the
new
program exp$
is
loaded.
Instead, the
new
program
is
merged
into the
resident
program.
That
is,
program
lines in
exp$
will
simply be
inserted into the resident
program
in
sequential
order. If line
numbers
in
exp$
coincide with
line
numbers
in the
resident
program,
the resident
lines will
be
replaced
by
those
from
exp$.
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