 VLSI Technology, Inc were chosen as silicon partner, since they already supplied Acorn with ROMs and some custom chips.VLSI produced the first ARM silicon on 26 April 1985—it worked first time and came to be known as ARM1.Its first practical application was as a second processor to the BBC Micro, where it was used to develop the simulation software to finish work on the support chips (VIDC, IOC, MEMC) and to speed up the operation of the CAD software used in developing ARM2.