Interton Sensor 20
Brief History
In the mid-seventies, the new transistorized televisions which replaced ones with vacuum tubes, often contains „finger-touch sensor buttons” instead of classic pushbuttons to change channels. Thanks to the West German company Interton Electronic, resistive „sensors” also appeared in pocket calculators in 1975: with the same functionality as the popular models already in production, but with a vacuum fluorescent display, and using Western Digital’s widely available FS1732 chip, the Sensor series appeared on the market: Sensor 9 has percentage calculation capabilities, Sensor 19 was equipped with memory, and can calculate quares, square roots and reciprocals, too. The red sensor button could be used to turn the machines on and off, the keys for the other functions remained traditional steel spring mechanisms. West German catalog store Quelle distributed the Sensor 9 as Privileg 807D, and Sensor 19 as Privileg 867MD models.
The PC 4010/4020 models that replaced the previous series were also made as a sensor version: the Sensor 10 and Sensor 20 models were completely identical in functionality and keyboard to the PC 4010 and PC 4020 calculators.
| Manufacturer: | Interton Electronic (West-Germany) |
| Mfg. date: | 1975 |
| Size: | 8×12,9×2,3 cm |
| Weight (ready for operate): | n.a. |
| Type: | four-function |
| Capacity: | 8 digits (input/display) 8 digits (internal precision) |
| Operating logic: | algebraic |
| CPU: | MOS MPS7541 007 |
| Registers: | 2 standard (with saving the pending operation) 1 constant (with saving the pending operation) 1 memory (with aritmetic) |
| Features: | %calculation with percent Ffloating-point notation Fixfixed-point notation: the listed decimals can be chosen (0-7) Sqrsquare root 1/xreciprocal |
| Display: | 9 digit VFD (Itron FG95A1) |
| Power: | 9V battery or adaptor |
Sensor 20
Inside of the Sensor 20
Sensor models
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