IBM PCjr

In the future, make sure you don't use the uppercase
letter "O" or lowercase letter "o" for the zero "0."
Also don't use the lowercase letter "1" for the number
" 1This can be especially important to you later
when you write your own computer programs. The
computer knows which is which, so you can't fool it!
A really great feature of your IBM PCyr keys is that
they will repeat if they are held down. This feature is
called typematic.
We'll prove it to you.
Hold down the zero (0) key.
Look at the row of zeros you've just made! (Be careful,
not to hold a key down too long unless you really want
what you just typed to be repeated.)
Getting Started 2-25