Commodore 128D - Editing Your Program; Erasing a Line from a Program; Duplicating a Line; Replacing a Line

Editing Your
Program
The following paragraphs will help you to type in your programs and
make corrections and additions to them.
Erasing a Line from a Program
Use the LIST command to display the program you typed previously.
Now type 10 and press RETURN. You just erased line 10 from the
program. LIST your program and see for yourself. If the old line 10 is
still on the screen, move the cursor up so that it is blinking anywhere
on that line. Now, if you press RETURN, line 10 is back in the comput
er's memory. You can also use the DELETE command to erase one
or more lines. See the BASIC 7.0 Encyclopedia in Chapter V for more
information on the DELETE command.
Duplicating a Line
Hold down the SHIFT key and press the CLR/HOME key on the upper
right side of your keyboard. This will clear your screen. Now LIST
your
program. Move the cursor up again so that it is blinking on the
"0" in the line numbered 10. Now type a 5 and press RETURN. You
have just duplicated (i.e., copied) line 10. The duplicate line is num
bered 15. Type LIST and press RETURN to see the program with the
duplicated lines.
Replacing a Line
You can replace a whole line by typing in the old line number fol
lowed by the text of the new line, then pressing RETURN. The old
version of the line will be erased from memory and replaced by the
new line as soon as you press RETURN.
Changing a Line
Suppose you want to add something in the middle of a line. Simply
move the cursor to the character or space that immediately follows
the spot where you want to insert the new material. Then hold down
the SHIFT key and the INST/DEL key together until there is enough
space to insert your new characters.
Try this example. Clear the computer's memory by typing NEW and
pressing RETURN. Then type:
10 ? "MY 128 IS GREAT"
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USING C128 MODE—Getting Started in BASIC