Commodore SR4912
Brief History
Commodore has a full spectrum of calculators from four-function basic models to most sophisticated scientific, or programmable types. To reach even lower prices, the 1978's new models were planned to assemble in Hong-Kong, using MPS 7561 chip family from MOS Technologies to made a wide variety of calculators built on identical printed circuits. The completed five models (financial F4902, the algebraic logic scientific SR4912 and SR9190, RPN scientific SR4921, and the programmable scientific P50) use the well-known housing, but have cheaper buttons rather than injection molded keys. The invade of mass-produced japanese calculators with LCD displays don't let these models to become hits, and confirms the management of Commodore that researching computers rather than calculators is the only way to survive. A year later, after running out the last series Commodore had stopped manufacturing calculators.
The SR4912 from the series Decision Maker compared to earlier models, though its internal precision was 10+2 digits and lacks of user-adjustable scientific notation, it's easier to use: it has 3 memory registers, all of them can accumulate, multiply and exchange with display register. Percentage calculations, two-level parentheses are available and triginometric functions can be made in gradians.
| Manufacturer: | Commodore Business Machines (USA/Hong-Kong) |
| Mfg. date: | 1978 |
| Size: | 8,1×15,2×4 cm |
| Weight (ready for operate): | n.a. |
| Type: | scientific |
| Capacity: | 8/8+2 digits (input/display) 10+2 digits (internal precision) |
| Operating logic: | algebraic |
| CPU: | MOS MPS7561 005 |
| Registers: | 2 standard (with saving the pending operation) 2 bracket (with saving the pending operation) 3 memory (with aritmetic) |
| Features: | %calculation with percent +/-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) logexponential and logarithmical functions (10- and e-base) yxraising to power SDone variable statistics: calculating mean and standard deviation |
| Display: | 14 digit LED |
| Power: | 9V battery or adaptor |
| Test results: | trigonometry:result of sin-1(cos-1(tan-1(tan(cos(sin(60°)))))), reference value: 60. 60.01228245 exponential:result of 0.999160000, reference value (first 14 digits): 3.0068804206375×10-70 3.006896579E-70 |
SR4912
Inside of the SR4912
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