The COPS I (Controller Oriented Processor System I) (originally just COPS) was a family of 4-bitmicrocontrollers 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 MM5781+MM5782 solution allowed for more complex designs whereas the MM5799 served as a single-chip solution, albeit more limited. The MM57140 was an even more advanced chip incorporating the keyboard input and display driver.