Execution_Clear

Execution Mode.

Execution_Interactiv

Calculator is used interactively.

Execution_Running

Calculator running a program.

Execution_Halt

Calculator debugging a program.

Execution_Pause

Calculator pauses for a sec.

Execution_1_Step

Do a single step and return to Execution_Halt.

Execution_Write

Calcluator is in write program mode.

Execution_Clear

Calcluator is in clear memory mode.

Execution_Alpha_Pause

Initial pause when alpha starts scrolling.