Freescale focuses on its microprocessor and microcontroller. The MOS integrated circuit led to the invention of the microprocessor. The microprocessor and memory chips are VLSI devices. It combined RAM and ROM on the same chip with a microprocessor. Both have an embedded microprocessor and memory. This led to the development of the first single-chip microprocessor, the Intel 4004. The C64 uses an 8-bit MOS Technology 6510 microprocessor. It requires a separate add on module which contains its own microprocessor and Operating system. Work began on a one-chip POWER microprocessor, designated the RSC (RISC Single Chip). The module contained its own Z-80 microprocessor as well as additional components. The MC6809 was the most advanced 8-bit microprocessor Motorola produced. In 1972, Intel launched the 8008, the first 8-bit microprocessor. Intel introduced the first commercial microprocessor, the 4-bit Intel 4004, in 1971. It utilized recycled effluent precisely controlled by a microprocessor. MIPS Computer Systems' R4000 microprocessor (1991) was the first MIPS III implementation.