Hewlett-Packard 45
Brief History
The first pocket scientific calculator in the world was the Hewlett-Packard's HP-35 in 1972, which became a big success despite of its high price. The next model, the HP-45 has been introduced a year later. The additional functions can be used with a shift key instead of separate buttons, so the dimensions of the machine didn't grow. In response of user's needs, conversion between rectangular and polar coordinates, between sexagesimal and decimal degrees, or between the most common US and metric units, use of the three units for angles, or calculating standard deviation were available with this model. It became also a success, production has been closed only in 1976, when several types of scientific calculators were in mass production for almost all purposes.
| Manufacturer: | Hewlett-Packard Corporation (USA/Singapore) |
| Mfg. date: | 1973-76 |
| Size: | 8×14,8×3,3 cm |
| Weight (ready for operate): | n.a. |
| Type: | scientific |
| Capacity: | 10/10+2 digits (input/display) 10+2 digits (internal precision) |
| Operating logic: | RPN |
| CPU: | MOSTEK MK6021P |
| Registers: | 4 standard 9 memory (with aritmetic) |
| Features: | %calculation with percent +/-change sign (direct entry of negative numbers) RVexchange registers (X-Y) Fixfixed-point notation: the listed decimals can be chosen (0-9) Sciscientific (exponential) notation Sqrsquare root x2square pivalue of pi (3.1415..) can be recalled 1/xreciprocal trigtrigonometrical functions (sin, cos, tan and inverses: arcsin, arccos, arctan) DMS-DDconversion of decimal and sexagesimal numbers logexponential and logarithmical functions (10- and e-base) yxraising to power SDone variable statistics: calculating mean and standard deviation P-Rconverting coordinates between rectangular and polar systems n!factorial |
| Display: | 15 digit LED (3×HP IC-tokozású) |
| Power: | battery pack or adaptor |
| Test results: | trigonometry:result of sin-1(cos-1(tan-1(tan(cos(sin(60°)))))), reference value: 60. 60.00111811 exponential:result of 0.999160000, reference value (first 14 digits): 3.0068804206375×10-70 - |
HP-45
PCB of the HP-45
Keyboard and display of the HP-45
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