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Homeland
810
1975
Texas Instruments
TI-2550
1974

MBO Alpha

Brief History
Among the Unitrex-branded Handy Mini pocket calculators manufactured by the Japanese Eiko Business Machines company, the only scientific model was the 80SR equipped with Rockwell International’s A4001 (formerly 15471) CPU. This calculator debuted originally in 1974, but was became well-known in Europe as MBO Alpha. The keyboard, which has a very simple structure and can also be found in Unitrex's contemporary models, unfortunately became extremely bouncing by the disintegrating sponge sheets and dirt, but the LED display made by Rohm has proven to be a durable part. Later, Unitrex's American and Canadian subsidiaries, albeit due to the bankruptcy of the Eiko company, kept their well-known brand alive by distributing mainly Hong Kong and Korean-made machines.
Manufacturer:MBO Schmidt & Niederleitner GmbH. & Co. KG (West-Germany)
OEM:Eiko Business Machine Co., Ltd. (Japan)
OEM model:80SR
Mfg. date:1974-75
Size:7,9×15,2×2 cm
Weight (ready for operate):n.a.
Type:scientific
Capacity:8 digits (input/display)
8 digits (internal precision)
Operating logic:algebraic
CPU:Rockwell A4001PC (15471)
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) RVexchange registers (X-Y) Ffloating-point notation BSbackspace (right-shift) function 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:9 digit LED (Rohm LAB-F-2)
Power:3×AA battery or adaptor
Test results:trigonometry:result of sin-1(cos-1(tan-1(tan(cos(sin(60°)))))), reference value: 60. 62.57928
exponential:result of 0.999160000, reference value (first 14 digits): 3.0068804206375×10-70 -

Alpha

Inside of the Alpha

Keyboard of the Alpha
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