Owner`s manual
45
SWAP (swap)
Calls out a program
in
the
file during execution of the program.
Format:
SWAP
11
[<device
name>
:]
<filename>
11
Note: Only
FDn
device name.
Abbreviated form:
SW.
Explanation:
• Subroutine calls separate program in file from program being executed. Program
in
program area
is
temporarily evacuated to vacant area in floppy disk, and called
program
is
read into text area. The original variable in the text area at this time
is
transferred to the called program. (See page 27.)
• An error occurs if a write-protect seal
is
put on the default drive floppy disk.
Example:
1 0
A=1:
B =2
20
30
,--.40
PR
I
NT
11
A =
";
A,
11
~!';~cf}·i:.,·.
.,
SWAP
11
F D 2 :
PRO
G'" . j ..
""
•
11
11
•
11
./i~~
" "
PR
I
NT
A =
,A,
B.:=,.
1'~'~ii.~,,~'
50
END
10
A=A*10:B=B*10
20
END
(SWAP
FD2
PROG)
..... When this program
is
executed, A = 1 and B = 1 are displayed on
CRT
screen
when line
20
is
executed. At line 30, the SWAP command
is
executed and the
program file
"PROG"
in floppy disk drive 2
is
executed. At end, automatically
returns to original program, A
=
10
and B =
20
are displayed when line
40
is
executed, and program execution finishes.