This old calculators - probably rare, probably not - are unknow on the Web. Any information you have about similar models, shipping date or factory will be appreciated (please use the mail form).
||International. This 12 digits calculator
is difficult to date. The old +/= and -/= key arrangement, minus and
overflow LED, suggest the built date in the first half of '70.
International is a common brand for old transistor radio, but rare on
calculators. No model name is present.
Weight/dimensions: 158 gm (8.5 x 13.5 x 2.7 cm)
Circuits: M58623-23P + 5 transistors + 2 LED
Power supply: 4x AA, 6V ext jack 3,5 mm
|Santron Electronics, Santronic 300SR.
This slide rule calculator sports a wonderful display with dual dimensions LED
digits: 10 'big' digits for mantissa and 2 'small' digits for exponent. Santron
Electronics sold other calculator, probably built by other calculator
Weight/dimensions: 172 gm (8 x 15.2 x 3.4 cm)
Circuits: A4800PC (Rockwell), 14 transistors (chip date-code: second half 1975)
Power supply: 3x AA, ext plug 4.5V (+ centre)
|Santronic 80S. This nice calculator
use 8 LED digits + sign display, square and % function, auto power-saving
Weight/dimensions: 152 gm (7.5 x 13.5 x 3 cm)
Circuits: TMS0855NC + 11 trans (chip date-code: first half 1975)
Power supply: 4x AA. ext plug
Mayfair Sound Products, model 2W01B. This big calculator looks as the Hitachi Soundesign models. Sports nice front blue glass with 9 fluorescent digit tubes (8 digits plus sign). Two advanced features: display battery-discharge warning indicator (show a rough ! in the sign digit when battery are low) and soft power-on switch, with auto shut-off function.
Weight/dimensions: 510 gm (11.5 x 19.5 x 4.5 cm)
Circuits: TMS0105NC, 19 transistors (chip date-code: first half 1973)
Power supply: 4x C cell, ext 6V 3.5 mm jack
Silver-Reed SE-8K. This nice calculato with dark plexyglass front and transparent keys
Weight/dimensions: 175 gm (9 x 13.5 x 3 cm)
Circuits: uPD261c, NEC D271D, Toshiba 73096, 12 trans
Power supply: 4x AA, ext 2,5 mm jack (- centre)
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