Caltronic 606 Handheld Electronic Calculator

This handheld electronic calculator has a plastic case with aluminum trim. The square plastic keys are indented at the middle (going from top to bottom). In addition to an array of ten digit keys and a back arrow key, the calculator has keys for four arithmetic functions, a red cancel key, an on/off switch, and another switch. The back arrow key allows one to see digits not visible on the six-digit red LED display.

A mark behind the display reads: caltronic 606. A socket for an adaptor is on the top edge. This example has no adapter.

The battery compartment at the top of the back would hold two batteries. This example presently has no batteries. A tag on the back gives an “Abbreviated Operation Guide” for the calculator. It includes a mark at the bottom: Made in Hong Kong. Another tag reads: 231314 (/) INSPECTED.

Unscrewing two screws allows one to open the back cover. A chip on the inside is marked: CT (/) CT5002 (/) 7322. This is a chip made by the California firm of Cal-Tex Semiconductor, Inc., presumably in 1973.

The shape of the keys and general appearance of the calculator resembles the Calfax 820CD, although they are by no means identical. Compare 1986.0988.21.

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