Atari 400 User Manual page 206

Since both drives are Drive 1, type 1, 1 (number
1, comma, number 1) and press RETURN.
STEP 3
A new prompt appears on the screen: INSERT
SOURCE DISK, TYPE RETURN. Remove the
DOS Master Diskette, and insert the diskette
you wish to copy (the
source
diskette). Be sure
to close the drive door. When you are done,
press the RETURN key. You will hear a series of
beeps as the computer reads the diskette and
loads the program into its memory.
STEP 4
When the beeps stop, a new prompt appears
on the screen : INSERT DESTINATION DISK,
TYPE RETURN. Remove the original diskette
from the drive and insert the newly formatted
diskette (the
destination
diskette). Close the
drive door, then press the RETURN key. You
will hear more beeps as the computer writes,
or copies, the information that is in its memory
onto the new diskette.
STEP 5
You will be prompted several times to insert
the source diskette, then the destination dis-
kette, as it copies the program. This is because
the computer cannot load the entire program
into its memory at one time (the program dis-
kette can hold more information than the com-
puter can hold). The computer loads part of
the program into its memory, then copies it;
then it reads a different section of the program
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