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Old Calculator Museum Advertising & Documentation Archive
Sharp Compet 20 (CS-20A)

Early advertisement for Sharp Compet 20 (CS-20A), December, 1965

The Sharp Compet 20 (Model CS-20A) was Sharp's first electronic calculator based on Silicon transistors, and Sharp's second electronic calculator. Sharp's first machine, the Sharp Compet 10, was based on Germaniun transistors. Silicon transistors offered higher speeds, lower power dissipation, and siginificantly improved reliability.

The Compet 20 provides a capacity of fourteen digits, with true credit balance (negative number) handling capability. It is a four-function machine, with automatic floating and fixed decimal point modes. The original sales price for the machine was around $1,050 in the US at introduction in the fall of 1965.

To learn more about the Compet 20, see the Old Calculator Web Museum exhibit: Sharp Compet 20.