Before the applications of [[microprocessor]]s to [[nuclear weapons]] during the 1970s, Sandia used hard logic - transistors or low-level gates on small scale integrated circuits. These provided little flexibility. If a change in functions was required, it was necessary to rebuild the logic boards. The advent of microprocessors added flexibility by accommodating changes simply by changing the [[software]]. Packed with advance microprocessors SANDAC was first used in Sandia's TIGER program in the 1970s,<ref>''A History of Exceptional Service'', Leland Johnson, Sandia National Laboratories, Albuquerque , New Mexico, 1997. Limited Edition.</ref> | Before the applications of [[microprocessor]]s to [[nuclear weapons]] during the 1970s, Sandia used hard logic - transistors or low-level gates on small scale integrated circuits. These provided little flexibility. If a change in functions was required, it was necessary to rebuild the logic boards. The advent of microprocessors added flexibility by accommodating changes simply by changing the [[software]]. Packed with advance microprocessors SANDAC was first used in Sandia's TIGER program in the 1970s,<ref>''A History of Exceptional Service'', Leland Johnson, Sandia National Laboratories, Albuquerque , New Mexico, 1997. Limited Edition.</ref> |