Citizen SR I
Brief History
Citizen introduced two new scientific calculators in 1977. Both had an interestingly shaped housing, uncommon key arrangement caused by the used Mitsubishi integrated circuits. The SR I and SR II models have a replaceable battery holder or a rechargeable battery pack can be attached to the upper part of the machines. SR I has display precision of 8 (5+2) digits, but internally the registers can store up to 8+2 digits (all digits can be recalled by pressing F DSP). SR II is a 8+2 (internally 10+2) digit precision machine, but it lacks floating point notation. In addition to functions of SR I, it has four memories with four-function arithmetic, can calculate hyperbolic functions and convert coordinates too.
| Manufacturer: | Citizen Business Machines Inc. (Japan) |
| Mfg. date: | 1977 |
| Size: | 8,8×16,8×2,3 cm |
| Weight (ready for operate): | 174 g |
| Type: | scientific |
| Capacity: | 8/5+2 digits (input/display) 8+2 digits (internal precision) |
| Operating logic: | algebraic |
| CPU: | Mitsubishi M58833P |
| Registers: | 2 standard (with saving the pending operation) 1 constant (with saving the pending operation) 2 bracket (with saving the pending operation) 1 memory (with aritmetic) |
| Features: | +/-change sign (direct entry of negative numbers) RVexchange registers (X-Y) Ffloating-point notation 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 n!factorial |
| Display: | 9 digit VFD (Futaba 9-ST-08) |
| Power: | 2×AA battery or 2×AA NiCd rechargeable battery 3V adaptor |
| Test results: | trigonometry:result of sin-1(cos-1(tan-1(tan(cos(sin(60°)))))), reference value: 60. 59.4715 exponential:result of 0.999160000, reference value (first 14 digits): 3.0068804206375×10-70 3.00709E-70 |
SR I
Inside of the SR I
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