IBM PCjr Manual page 57

To exit the "Keyboard Adventure" entirely, you would
press and hold the Control (Ctrl) and Alt keys while
you press the Delete (Del) key. These keys are called
System Reset keys because they restart your computer.
You will learn more about them and the rest of the keys
in the keyboard section of this book.
Let's exit from the "Keyboard Adventure" now.
To end the "Keyboard Adventure"
program, press and hold the Ctrl and
Alt keys while you press the Del
Key.
The IBM Personal Computer Basic
Version 01.20 Copyright IBM Corp 1981
XXXXX Bytes free
OK
iLU'ii ?fiTtT7H aCBngi4HEQi
You should now have the "IBM Personal Computer"
BASIC Message in front of you. (Of course, if you
wanted to return to the "Keyboard Adventure" from
this screen, you could always press the Esc key - just as
you did to get here the first time.)
Getting Started 2-41