CASIO fx-991ES Easter Eggs

Diagnostic Mode - 9.3/10 with 14 votes
Turn on the calculator:
* Press [ON] whilst holding [SHIFT]+[7]. Calculator can be on or off.
* Press [SHIFT] five times to cycle through the various screen modes.
* Press [AC]
* You can change the LCD contrast using D-Pad [<] or [>], when you are... more

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