HP 49g+ - Manual (Page 781)

Page B-2
keyboard in the space occupied by rows 2 and 3. Each key has three, four,
or five functions. The main key functions are shown in the figure below. To
operate this main key functions simply press the corresponding key. We will
refer to the keys by the row and column where they are located in the sketch
above, thus, key (10,1) is the ON key.
Main key functions in the calculator’s keyboard