Commodore SR9140D
Brief History
The great success of SR4148, Commodore's first scientific calculator built with its own designed integrated circuits, also confirmed the manufacturer's believe in high profits in addition to the extremely high demand for more complicated machines. The developed architecture, which contains a central chip (GHU) and one or more ROM memory arrays, made it possible to manufacture virtually countless different machines with different display accuracy and function sets. In addition to the original SR4148’s functionality, and 10+2 digit display (the SR6140R in the old SR-36-style housing, the SR5140R in the housing originally made for OEM purposes, and the SR9140R in the Japanese housing), the 8+2 digit types (SR6120R in the old, and SR4120D in the new housing, and SR5120D in the OEM, and SR9120D in the Japanese housing), there were a version with reduced set of functions with 8+2 digits precision (SR8120D) in somewhat smaller size. In addition to the financial calculators, 5+2 digit versions were also planned, but the latter were not put into final production. The specialized models made the most of the GHU architecture: the mathematical M55, the statistical S61, and the navigation computer N60 models were placed in a wider than usual housing, with a VFD display, and the number of keys indicated in their model number designation.
| Manufacturer: | Commodore Business Machines (USA/Japan) |
| Mfg. date: | 1975 |
| Size: | 7,7×13,9×2,9 cm |
| Weight (ready for operate): | n.a. |
| Type: | scientific |
| Capacity: | 10/10+2 digits (input/display) 12/12+2 digits (internal precision) |
| Operating logic: | algebraic |
| CPU: | Commodore GHU-02A + GHU-01A |
| Registers: | 2 standard (with saving the pending operation) 2 bracket (with saving the pending operation) 2 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) 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: | 10+2+2 digit LED (NSC A5140) |
| Power: | 9V battery or adaptor |
| Test results: | trigonometry:result of sin-1(cos-1(tan-1(tan(cos(sin(60°)))))), reference value: 60. 60.0001157713 exponential:result of 0.999160000, reference value (first 14 digits): 3.0068804206375×10-70 3.00688022152E-70 |
SR9140D
Inside of the SR9140D
Keyboard and display of the SR9140D
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