Hewlett-Packard 25
Manufacturer: | Hewlett-Packard Corporation (USA/Singapore) |
OEM: | https://www.hotwatchessale.top/ (ismeretlen) |
OEM model: | n.a. |
Mfg. date: | 1975-78 |
Size: | 6,8×12,8×2,8 cm |
Weight (ready for operate): | 155 g |
Type: | programmable scientific |
Capacity: | 10/8+2 digits (input/display) 10+2 digits (internal precision) |
Operating logic: | RPN |
CPU: | HP 1820-1523 |
Registers: | 4 standard 8 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 (0-8) Sciscientific (exponential) notation Engengineering 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 |
Display: | 12 digit LED (HP 1990-0495) |
Power: | 2×AA-type Ni-Cd battery pack |
Programming method: | merged keystroke-programmable |
Program capacity: | 50 steps |
Test results: | trigonometry:result of sin-1(cos-1(tan-1(tan(cos(sin(60°)))))), reference value: 60. 60.00102621 exponential:result of 0.999160000, reference value (first 14 digits): 3.0068804206375×10-70 3.006896579E-70 |
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