When you turn the TX81Z power on, it displays a greeting message, initially set to "<Good morning!!>". You can change this by turning the power on while pressing STORE. Use the CURSOR keys to move the blinking cursor and use DEC/INC to select characters. (The character table is on p.23.) When you are finished, press PARAMETER, EDIT or PLAY to return to normal operation.
The next time you turn the power on, your new message will be displayed.
— TX81Z manual p.46
The question remains: why is it initially set to "<Good morning!!>"? My personal theory is that when you power the unit on, in a sense you're waking up the unit, and it's only polite for someone (or something) to say "<Good morning!!>" when they wake up. I say that all the time.
I hope that resolves the deep concern I know you have been harboring about this.
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