Híradástechnika TK-1023
Brief History
The first two scientific calculator (TK-835 in 1974 and TK-891 a year later) strengthened Híradástechnika's decision to assemble more
calculators like those. The agreement between two hungarian calculator-manufacturer, EMG and Híradástechnika is about
sharing the market and the produced types of calculators: EMG makes desktop calculators, HT makes scientific pocket-sized models, was signed
in the end of 1975, so HT started to assemble National Semiconductor's two scientific models, the NOVUS 4520 Scientist
as HT TK-1023 (due to constraints of valid shipping agreements, TK-891-1 type is used for a while) from 1976, and NOVUS
4525 Scientist PR programmable version as PTK-1023 from 1977. Later a more complex and professional model was adopted, that was
the TK-1024, as described on its own page.
| Manufacturer: | Híradástechnika Szövetkezet (Hungary) |
| OEM: | National Semiconductor https://www.rolexuk.me/ (USA) |
| OEM model: | NOVUS 4520 |
| Mfg. date: | 1976-77 |
| Size: | 7,5×15,5×3,5 cm |
| Weight (ready for operate): | 190 g |
| Price: | HUF 3.600 (HT, 1976) |
| Type: | scientific |
| Capacity: | 8/8+2 digits (input/display) 8/8+2 digits (internal precision) |
| Operating logic: | RPN |
| CPU: | NSC MM5758N |
| Registers: | 4 standard 1 memory (without arithmetic) |
| Features: | +/-change sign (direct entry of negative numbers) RVexchange registers (X-Y) Ffloating-point notation Sciscientific (exponential) notation Sqrsquare root pivalue of pi (3.1415..) can be recalled 1/xreciprocal trigtrigonometrical functions (sin, cos, tan and inverses: arcsin, arccos, arctan) logexponential and logarithmical functions (10- and e-base) yxraising to power |
| Display: | 8+2+2 digit LED (NSC NSA5101) |
| Power: | 3×AA NiCd battery (built-in) |
| Test results: | trigonometry:result of sin-1(cos-1(tan-1(tan(cos(sin(60°)))))), reference value: 60. - exponential:result of 0.999160000, reference value (first 14 digits): 3.0068804206375×10-70 2.805433E-70 |
PCBs
Original TK-1023 (left), original PTK-1023 (right), and an A series TK-1023 without programmer circuitry (middle)
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