| Operator | Description |
| + | Floating-point addition (A on the keypad) |
| | Floating-point subtraction (B on the keypad) |
| Χ | Floating-point multiplication (C on the keypad) |
| / | Floating-point division (D on the keypad) |
| E | and e Enter key (# on the keypad) |
| 0 through 9 | Digits zero through nine |
| . | Decimal point (Χ on the keypad) |
Table 3The serial interface and 4 Χ 4 keypad support certain functions, expressions, and characters with the calculator hardware and firmware configured for using the RPN calculator mode. In order to clear the display, press any key after the calculation has been performed. Note that these are the operators and character set currently used by the RPN calculator.