3 µm process
The 3 μm process is the level of MOSFET semiconductor process technology that was reached around 1977, by leading semiconductor companies such as Intel.

Products featuring 3 μm manufacturing process
 Intel 8085 CPU launched in 1976 was manufactured using 3.2 μm NMOS (HMOS) process. 
 Intel 8086 CPU launched in 1978 was manufactured using 3.2 μm NMOS (HMOS) process.
 Hitachi's 4kbit HM6147 SRAM memory chip, launched in 1978, introduced the twin-well CMOS process, at 3 μm.
 Intel 8088 CPU launched in 1979 was manufactured using 3.2 μm NMOS (HMOS) process.
 Motorola 68000 (MC68000) CPU, launched in 1979, was originally fabricated using an HMOS process with a 3.5 μm feature size.
 The ARM1 was launched in 1985 and manufactured on a 3μm process.

References

03000
Computer-related introductions in 1975