Atari 400 Basic Reference Manual page 39

MODIFYING A
BASIC PROGRAM
ON DISK
To execute a "chained" program, use the following steps:
1.
Cue the tape to the beginning of part 1 of the program.
2. Press PLAY button on the recorder.
3. Type RUN"C:"
ll!I.I.!ImJ .
4. When the "beep" sounds, press
ll!I.I.!ImJ
again.
The computer automatically loads the first part of the program, runs it, and
sounds a "beep" to indicate when to hit the space bar or
Em
to trigger the
tape motor for the second LOAD/RUN. The loading takes a few seconds.
Note:
A one-part program can be recorded and reloaded in the same way or
CSA VE and CLOAD can be used.
Note:
Remember to boot DOS before typing in your program.
The procedure for modifying an existing BASIC program stored on a diskette is
demonstrated in the following steps:
1. Turn off ATARI console and insert BASIC cartridge.
2. Connect disk drive and turn it on -without inserting diskette.
3. Wait for Busy Light to go out and for the drive to stop. Open disk drive door.
4. Insert diskette (with DOS) and close door.
5. Turn on console. DOS should boot in and the screen show READY.
6. To load program from disk, type
LOAD "D:filename.ext
7. Modify program (or type in new program).
8. To save program on disk, type
SAVE "D:filename.ext
9. Always wait for the Busy light to go out before removing diskette.
10. To get a Directory listing, do not remove diskette and type
DOS
Upon
lliilm,
the DOS Menu will be displayed. Select command letter A,
type it, and press
liill!m
twice to list the directory on the screen; or type A
followed by pressing
lliilm
then
P:
liill!m
to list directory on the printer.
11. To return to BASIC, type
B
liill!m
or press
Utiii!&l;li@:U .
IIO Commands and Devices
31