IBM PCjr Manual page 21

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Turn your IBM PCyr power on.
I This is the international symbol
for On.
O This is the international symbol
for Off.
Following the IBM Color Bar screen,
the IBM Personal Computer BASIC
Message Screen appears.
Adjust the contrast, brightness and
fine tuning on your display or
television so it is comfortable for
you.
The IBM Personal Computer Basic
Version 01.20 Copyright IBM Corp.1981
XXXXX Bytes free
OK
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Getting Started 2-5