Wikipedia
CHMOS
CHMOS refers to one of a series of Intel CMOS processes developed from their HMOS process. (H stands for high-density).
CHMOS was used in the Intel 80C51BH, a new version of their standard MCS-51 microcontroller. The chip was also used in later versions of Intel 8086, and the 80C88, which were fully static version of the Intel 8088. The Intel 80386 was made in 1.5 µm CHMOS III, and later in 1.0 µm CHMOS IV.
CHMOS III used 1.5 micron lithography, p-well processing, and two layers of metal.
CHMOS IV used 1.0 µm lithography. Many versions of the Intel 80486 were made in 1.0 µm CHMOS IV. CHMOS V used 0.8 µm lithography and 3 metal layers, and was used in later versions of the 80386 and 80486 and Intel i860.