Use this tag for questions related to the RCA 1802 and related CPUs.
The RCA CDP1802 is an 8-bit CMOS microprocessor introduced by RCA in early 1976.
It was a 40-pin integrated circuit CPU, implemented using a "Complementary Symmetry Monolithic Array Computer" architecture, and therefore commonly referred to (along with the 1801, its two-chip equivalent) as COSMAC, at least within RCA. Hobbyists tended to just call it the 1802.
It was used in, for example, the COSMAC Elf and the COMX-35 computer.