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).
|Harden, ESR/06. This scientific calculator
has good design and original key shape; it's built by Rockwell for one of the early italian hi-tech distributor:
Harden (name molded in the
front plate). Based in Sospiro (Cremona) Harden sold in the '70 TI, CBM and
other calculators; it also become the first italian Commodore partner selling the personal
computer PET 2001.
Weight/dimensions: 176 gm (9 x 15.5 x 3.3 cm)
Circuits: A4002 (Rockwell) chip date-code: second half 1974)
Power supply: 4x AA ni-cd, ext 3.5 mm
Tesak, Syrtis 10P. This 1973 pocket calculator looks like some old Busicom models (but is bigger and based on TI chip technology). It has 10 LED digits + one for sign display (built with multiple micro modules). The back label report "Tesak, made in Italy"; Tesak brand is also printed on the PCB. No information is available about this calculator brand.
Weight/dimensions: 112 gm (6.5 x 14.5 x 1.8 cm)
Circuits: TMS0106NC, SN75491, 2x SN75492, 4 trans (chip date-code: half 1973)
Power supply: 4x AA (no external power connection)
Sanyo_CZ-8102. Slim scientific calculator built with heavy front alluminium shell and plastic back. It use 8+1 LED bar with magnification lens; probably is one of the early pocket scientific calculator powered with button cell (4x 625).
Weight/dimensions: 96 gm (7 x 14.5 x 1.3 cm)
Circuits: A4001PC (Rockwell), 3x BA609 (chip date-code first half 75)
Power supply: 4x 625 or external docking with power connection
Philips, SBC 168. Philips was not deep involved in the calculator business. This solar model, built with 8 cell solar battery, may be one of the first solar calculators.
Weight/dimensions: 46 gm (6 x 10.5 x 0.6 cm)
Power supply: solar cell
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