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Commodore US*8 Desktop Calculator

I found this calculator at a Goodwill Industries thrift store for $2.00. It works great.

This machine, based on the date code on the single LSI IC inside, is from early 1973. It is a desk-top style calculator, AC-powered. It uses a single Texas Instruments IC (TMS0103NC, one of TI's first 'all on a chip' calculator IC's) for the calculating brains, with an assortment of plastic-case transistors and discrete components for power supply and display driving functions.

The display is a Burroughs Panaplex-style display, with standard seven segment digit arrangement. The display panel has 9 digits, but the left-most digit is used only for sign (-) and error/overflow indication.

The machine is very conventional in operation, with adding-machine style +=, -= keys for accumulating sums and differences, and multiply/divide keys, with the += key used for calculating the products or quotients. A slide switch selects several fixed decimal point, or full floating decimal modes.

Commodore was a major player in the early electronic calculator market, being one of the first to 'mass market' calculators for use in homes instead of business.


Text and images Copyright ©1997-2011, Rick Bensene.