IBM PCjr

If you press the Fn key by accident, press the Shift key
to cancel the Function mode.
You can lock your keyboard in the Function mode by
pressing and holding the Shift and Fn keys and then
pressing the Bsc key. When locked in the Function
mode, all keys with green stripes perform their
functions without needing the Fn key pressed first. To
unlock the Function mode, press and hold Shift and
Fn and then press Bsc.
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Keyboard 3-23