Brother 718SR
Brief History
After the Japanese companies at the forefront of calculator development released their first pocket calculators equipped with FEM-type liquid crystal displays in 1975-76, it did not take long for the background industry to catch up and start producing chips for scientific versions. Brother introduced two LCD scientific calculators relatively late: the simpler, 8 or 5+2 digit 718SR, and the 8+2 digit 738SR models were in production from 1978 to 1983. Both are made with a Toshiba chip and a specially designed Epson display — which can be found in similar models from many other manufacturers. At the time of their release, with these elegant machines, which, when they were taken out of production, already looked very outdated thanks to their yellow LCD display, their slow operation, and their set of functions that had become standard in the meantime, Brother's own calculator production also ceased. It is interesting that the Epson LD-B series of displays could have been reliably equipped with the later standard gray polarizer, however Brother stuck to the yellow polarizers made for the earlier LD series of displays until the end of production.
| Manufacturer: | Brother Industries Ltd. (Japan) |
| Mfg. date: | 1978-83 |
| Size: | 7,4×13,4×1 cm |
| Weight (ready for operate): | n.a. |
| Type: | scientific |
| Capacity: | 8/5+2 digits (input/display) 9+2 digits (internal precision) |
| Operating logic: | algebraic |
| CPU: | Toshiba T3637 |
| Registers: | 2 standard (with saving the pending operation) 1 constant (with saving the pending operation) 3 bracket (with saving the pending operation) 1 memory (with aritmetic) |
| Features: | %calculation with percent +/-change sign (direct entry of negative numbers) 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 |
| Display: | 8+1 digit LCD (Epson LD-B326) |
| Power: | 2×LR44 button cell |
| Test results: | trigonometry:result of sin-1(cos-1(tan-1(tan(cos(sin(60°)))))), reference value: 60. 59.987247 exponential:result of 0.999160000, reference value (first 14 digits): 3.0068804206375×10-70 3.00688E-70 |
718SR
Inside of the 718SR
Full packaging of the 718SR
718SR and 738SR
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