Mondimat ESR-83
Brief History
The french catalog store La Redoute in the 1970s expanded its range of products as the others did: more electronic appliances were introduced. Some calculators can be found in the catalogs with the brand Mondimat, a first in its own category, the ESR-83 has a NEC D1856 CPU and an Epson liquid crystal display with yellow filter as usual in its time. It is interesting that secondary functions are labelled under the corresponding keys. A bit redesigned interiors can be found in Technico’s ESR-83 which has the same origin as this.
| Manufacturer: | Le Redoute SA (France) |
| Mfg. date: | 1977 |
| Size: | 7×13,5×11 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: | NEC D1851G |
| 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: | 8+1 digit LCD (EPSON LD-0506) |
| Power: | 3×LR44 button cell |
| Test results: | trigonometry:result of sin-1(cos-1(tan-1(tan(cos(sin(60°)))))), reference value: 60. 60.0154861 exponential:result of 0.999160000, reference value (first 14 digits): 3.0068804206375×10-70 3.007363E-70 |
Mondimat ESR-83
Inside of the ESR-83
Keyboard and display of the ESR-83
Similar items
