IBM PCjr Manual page 45

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Now, let's print something on the screen.
Type: P.C. is terrific. (Remember
to press the Space bar after typing
each word.)
If you tjrpe fast, you wiU have to wait until P.C. places
the rest of the keys on the keyboard before aU of the
words appear on the screen.
Now, hold down the Cursor Left key
until the cursor moves back to the
first letter on the line, and then
release it.
j Now hold down the Space bar.
See how the Space bar erases the letters on the screen
as it moves forward? (After erasing the letters, use the
Backspace key to move the cursor back to the far left
of the screen.)
Getting Started 2-29