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Texas Instruments
SR-52
1975-77
Litronix
2290
1975-77

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

HP-25
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