Intertronic Mini 8
Brief History
Since the late 1980s, various electronic devices (mainly radios, clocks, wristwatches, calculators and quartz games) have been marketed under the Intertronic brand. It is not known whether this EIKO calculator from 1974, which also marketed under its own brand name as Unitrex Mini 8, belongs to the mentioned Intertronic brand, or not.
The calculator itself is very interesting because of its Frontier chip.
| Manufacturer: | Intertronic (ismeretlen) |
| OEM: | Eiko Business Machine Co., Ltd. (Japan) |
| OEM model: | Mini 8 |
| Mfg. date: | 1974 |
| Size: | 7×12,2×2,4 cm |
| Weight (ready for operate): | n.a. |
| Type: | four-function |
| Capacity: | 8 digits (input/display) 8 digits (internal precision) |
| Operating logic: | arithmetic |
| CPU: | Frontier 1106 |
| Registers: | 2 standard (with saving the pending operation) 1 constant (with saving the pending operation) |
| Features: | %calculation with percent +/-change sign (direct entry of negative numbers) Ffloating-point notation |
| Display: | 9 digit LED |
| Power: | 9V battery |
Mini 8
Inside of the Mini 8
Detailed Description
Odd features of the Frontier 1106 chip:
- operations with a constant can also be performed by pressing again the operation keys: in the case of multiplication the 1st operand will be stored, in the case of division the 2nd operand will be stored as constant. = repeats the last constant operation: 1000 ÷ 5 × × × will result in 5000.
- negative signs: appears at all digits where no numerical digit is displayed
- 0 cannot be entered as the first digit. Enter fractions with integer part of 0 can be started by pressing .
- dividing by zero does not cause an error and gives a result of 0
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