MBO 80SCF
Brief History
Well-known and unknown manufacturers widely used cheaper electronic parts for constructing pocket calculators. In 1975, a year before flooding the market with japanese circuits, american (or canadian) chips were the optimal choice. The inexpensive chips were much simpler than the most state-of-the-art ones and often had poor accuracy. The General Instrument-made C596 (for LED displays) and CF596 (for vacuum-fluorescent displays) allowed calculating the mostly used trigonometric, exponential and logarithmic functions with an ordinary 8-digit display, which can be divided to 5+2 digits for displaying results in exponential notation. Although the {CH NOT} function can be used for displaying the full mantissa, internal precision of this machine was often identical to a precision slide rule.
Western german MBO company bought calculators from all over the world. The 80SCF produced in small amounts were a rare curiosity of its type.
It is interesting to compare this machine to the General Instrument's self-made EZ3500 (Radio Shack EC-475, or the hungarian OEM version, HT TK-891) model: the japanese version has greater numerical readout, more comfortable keyboard.
| Manufacturer: | MBO Schmidt & Niederleitner GmbH. & Co. KG (West-Germany) |
| Mfg. date: | 1975 |
| Size: | 8,5×13,4×2,7 cm |
| Weight (ready for operate): | 251 g |
| Type: | scientific |
| Capacity: | 8 digits (input/display) 8 digits (internal precision) |
| Operating logic: | algebraic |
| CPU: | General Instrument CF596 |
| Registers: | 2 standard (with saving the pending operation) 1 constant (with saving the pending operation) 1 memory (with aritmetic) |
| Features: | +/-change sign (direct entry of negative numbers) 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) |
| Display: | 9 digit VFD (Itron FG95A) |
| Power: | 4×AA-type battery 6V adaptor |
| Test results: | trigonometry:result of sin-1(cos-1(tan-1(tan(cos(sin(60°)))))), reference value: 60. 67.497 exponential:result of 0.999160000, reference value (first 14 digits): 3.0068804206375×10-70 - |
80SCF
Inside of the 80SCF
Keyboard of the 80SCF
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