The Controller Oriented Processor System I or COPS I (originally just COPS) is a family of 4-bit microcontrollers developed by National Semiconductor. COPS, as it was originally called, was released to the market in 1976. It was manufactured in PMOS technology. A year later, National introduced the COPS II, an NMOS (and later CMOS) versions of those chips.

The family came in four flavors: 5781, 57129, 5799, 75140. The 5781 was a multi-chip solution allowing more advanced calculators to be designed. The 57129 is a larger version of the 5781. The 5799 was a single chip equivalent of to the 5781/5782 system. The 75140 contained everything including calculator keyboard input and display driver.

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