HP-45
HP-45 Advanced Scientific Electronic Pocket Calculator | |
| Type | Scientific |
|---|---|
| Introduced | 1973 |
| Discontinued | 1976 |
| Calculator | |
| Entry mode | RPN |
| Display type | Red LED seven-segment display |
| Display size | 15 digits (decimal point uses one digit), (±10±99) |
| Programming | |
| Programming language(s) | RPN key stroke |
| Memory register | Four-register operational stack with nine addressable memory registers + LASTx register |
| Other | |
| Power supply | Internal rechargeable battery or 115/230 V AC, 5 W |
| Weight | Calculator: 9 oz (260 g), recharger: 5 oz (140 g) |
| Dimensions | Length: 5.8 inches (150 mm), width: 3.2 inches (81 mm), height: 0.7–1.3 inches (18–33 mm) |
The HP-45 is the second scientific pocket calculator introduced by Hewlett-Packard, adding to the features of the HP-35. It was introduced in 1973 with an MSRP of US$395 (equivalent to $2,798 in 2024). Especially noteworthy was its pioneering addition of a shift key that gave other keys alternate functions.
The calculator was code-named Wizard, which is the first known use of a code name for a calculator.
It also contained an Easter egg that allowed users to access a not-especially accurate stopwatch mode. An accurate version of the stopwatch mode was officially featured in the 1975 successor of the HP-45, the HP-55.
The display of the HP-45 hidden timer showing 00 hours 00 minutes 07 seconds and 58/100 second.
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| HP-45 functions | |
|---|---|
| Arithmetic | +, −, ×, ÷ |
| Trigonometry | sin, arc sin; cos, arc cos; tan, arc tan (decimal degrees, radians or grads). |
| Logarithms | log10x, 10x; logex, ex |
| Conversions | Decimal degrees, radians or grads ↔ degrees–min.–sec. Rectangular coordinates ↔ polar coordinates. Conversion units: cm/in, kg/lb, ltr/gal |
| Other | 1/x, √x, x2, yx, n!, %, Δ%, π, vector arithmetic, register arithmetic. Statistical accumulation with mean and standard deviation calculations. Fixed point and scientific display modes, 0 – 9 decimal places round-off. |