Next: Reverse Polish Notation Up: How to Use the Previous: Introduction

# The Key Board

The picture above is a reproduction of the HP48G/GX keyboard. Since it is not my desire to overwhelm, not all of the keyboard is portrayed. Only the most needed labels are included.

The key in row 9 and column 1 is used to turn the calculator on and off. To turn the HP48G/GX on push . Notice the word cancel below this key. If the calculator is already turned on, this key now functions as a cancel key. To turn the calculator off push 2pt . A second key we need to discuss is . This key enables the alpha input mode of the HP48G/GX. For example to enter the character A, push . If more than one alpha character needs to be entered, either hold down the alpha key while entering the charactors, or push the alpha key twice to place the HP48G/GX in permanent alpha mode. To leave alpha mode, push the alpha key one more time, or push . To enter a lower case letter push 2pt , and then the desired letter. Note: Greek letters can be entered by using 2pt .

Notice the four keys that have arrows on them in rows two and three. On the actual keyboard these are triangles, not arrows, and these keys are used to move the cursor. There is a fifth key, in row 5 and column 6, that also has an arrow on it. This key is used to edit our input. For example, suppose we wanted to enter the number 78 and instead pushed the key twice, that is we had 77 on the command line. To correct this typo, push the key once to delete the second 7. Then push .

Each key has more than one label associated with it. For example, the key can be used for three different calculations. To compute , push the keys 2pt \ . To compute log 15, push 2pt \ . To compute , push . Pushing 2pt followed by a key stroke activates the command whose symbol appears at the top left of the key pushed, and pushing 2pt will activate the command shown on the top right of the key.

Next: Reverse Polish Notation Up: How to Use the Previous: Introduction

Mike Stecher
Thu Mar 21 09:53:31 CST 1996