The MASTER-DISPLAY push buttons function is build using a mechanical interface and an electrical interface made with push buttons mounted on the calculator.
The MASTER-DISPLAY provides 31 push buttons. Push buttons positions are shown in the Model below (KEY_x).

1 - Mnemonics Description

Mnemonic	STraToN Type	Description
Input_Boo	BOOL	Indicates the the state of the push button to the applicative software. set to 1 when the push button is pressed by user.