field 18 fig2 with the result value the processor then recalculates the equivalent value using the prior conversion mode values of from and into countries and displays it in the numeric field 20 fig2 as shown by the block 106 if the prior processing mode was not the calculating mode the processor configures the display 12 fig2 in its conversion mode and sets the conversion mode default display as shown by a block 108 as shown by a block 110 the processor is then operative to get a button as shown by a block 112 if the button value equals the into key of the keypad 22 fig3 the processor is operative to advance the into country field 16 fig2 as shown by a block 114 as shown by a block 116 if the button value equals the from key of the keypad 22 fig3 the processor is operative to advance the from country field 14 fig2 as shown by a block 118 as shown by a block 120 if the button value equals one of the numeric keys or the decimal point the processor is operative to update the from number field 18 fig2 as shown by a block 122 as shown by a block 124 if the button value is the on c key of the keypad 22 fig3 the processor is operative to reset the display as shown by a block 126 as shown by a block 128 if the button value equals the go key of the keypad 22 fig3 the processor is then operative to determine if the button press was greater than two 2 seconds as shown by a block 130 if it is greater than two 2 seconds.