EMG HUNOR 121
Brief History
The member with highest precision of the hungarian HUNOR desktop calculator family was announced at Budapest Fair in 1974, mass production of a slightly modified version started in 1975. Based on experiences of the HUNOR 81, the high-end model named HUNOR 121 used japanese single VFD tubes instead of the unreliable incandescent display. The dimensions of the circuitry and additional discrete electronic parts of this calculator didn't allow battery operation used in other HUNOR portable calculators, limiting its usability. For years, despite of its extremely high price, for hungarian companies it was the only calculator which allows entering and displaying big numbers.
In 1976, a modified version was produced: the PCBs were redesigned for the new display control circuit. Some machine of this version used Futaba VFD tubes instead of widely used NEC LD8035E tubes. To reduce the manufacturing costs and indirectly the end-user price, a simplified version (HUNOR 121B) with NEC-made CPU replaced the old HUNOR 121 from 1977.
| Manufacturer: | Elektronikus Mérőkészülékek Gyára (Hungary) |
| Mfg. date: | 1975-76 |
| Size: | 18,2×20,8×5,9 cm |
| Weight (ready for operate): | 980 g |
| Price: | HUF 18.800 (papírbolt, 1976) |
| Type: | four-function desktop |
| Capacity: | 12 digits (input/display) 12 digits (internal precision) |
| Operating logic: | arithmetic |
| CPU: | Texas Instruments TMS0201NC + TMS0301NC |
| Registers: | 2 standard (with saving the pending operation) 1 constant (with saving the pending operation) 1 memory (with arithmetic and auto-summation) |
| Features: | %calculation with percent +/-change sign (direct entry of negative numbers) RVexchange registers (X-Y) Ffloating-point notation Fixfixed-point notation: the listed decimals can be chosen (0, 1, 2, 4, 8) BSbackspace (right-shift) function |
| Display: | 13 digit VFD (13×NEC LD8035E) |
| Power: | 220V AC |
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