Micral N was the earliest commercial, non-kit microcomputer based on a microprocessor, the Intel 8008. Nanocomputer refers to a computer smaller than the microcomputer, which is smaller than the minicomputer. The technique was common in 8-bit microcomputer systems. This was also standard operating procedure for early microcomputer and home computer systems. Those selling advanced minicomputers were overtaken by the microcomputer. For example, one bicycle computer specifies that it uses a "4-bit 1-chip microcomputer". The original IBM PC was the most influential microcomputer to use the 8088. This was a two-chip microcomputer. Atari proposed in 1980 that it act as original equipment manufacturer for an IBM microcomputer. It was the first large software company in the microcomputer world. This is one of the first task-switching programs available for any microcomputer. Custom version written for Western Digital to run on their Pascal MicroEngine microcomputer. Around 1978 Elbit Systems in Israel developed a CP/M capable microcomputer named the DS2100. Perhaps more important was the lack of first-class high-level language compilers suitable for microcomputer use. VisiCalc is credited as the defining killer app in the microcomputer industry.