HOW DO I CHANGE THE HOUR TO AM AND NOT PM????
I cannot find a manual for the MP49D, so am using that for a similar calculator.
With the calculator turned on, press the time/calendar button twice. Now press and hold the "time set" button for three seconds. The display should show hours and minutes with the first character blinking, followed by an A or a P. Key in the time (if necessary to change it) using the number buttons, and press the AM/PM button to select A or P. When done, press the "time set" button again, then press the On/Clear button to return to calculation mode.