Radio Shack TRS-80 Trsdos & Disk Basic Reference Manual page 116

DISK BASIC
MERGE
provides
a
convenient
means
of putting
modular programs
together.
For example, an
often-used
set
of
BASIC
subroutines can
be tacked onto
a variety
of programs with
this
command.
For example, suppose
the following
program
is
in
RAM:
16
REM.
. .
MAIN PROGRAM
26 GOSUB 1000
30
REM.
.
.
MORE PROGRRM LINES HERE
399 END
1000
REM.
. .
NEED TO RDD SUBROUTINES HERE
1010
REM.
. .
SO USE MERGE COMMAND
1020 PRINT"SUBROUTINE NOT AVAILABLE"
:
RETURN
And
suppose the following
program
is
stored
on
disk in
ASCII
format:
1000
REM.
. .
BEGINNING
OF
SUBROUTINE
1010 PRINT"EXECUTING
SUBROUTINE.
. .
"
1020
REM.
. .
MORE PROGRAM LINES HERE
1100 RETURN
Assuming the subroutine
program
is
named
SUB
/TXT,
then
we
could
MERGE
it
with the statement:
MERGE"SUB/fXT"
and
the resultant
program
in
RAM
would
be:
10
REM.
. .
MAIN PROGRAM
20 GOSUB 1000
30
REM.
. .
MORE PROGRAM LINES HERE
999 END
1000
REM.
. .
BEGINNING OF
SUBROUTINE
1010 PRINT-'EXECUTING SUBROUTINE.
. .
"
1020
REM.
.
.
MORE PROGRAM LINES HERE
1100 RETURN
Note
that
MERGE
closes
all files
and
clears
all
variables.
Upon
completion,
BASIC
returns to the
command
mode.
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