Microprocessors as emulators in a control system environment

Computers have been used in military systems for over two decades. There is interest in replacing some ancient computers with present day microprocessors since a number of benefits may accrue. However, there may be some constraining factors such as the retention of the original programs that require accurate emulation of the original machine. Some of these issues are discussed for a case study involving the replacement of a computer in a navigation control loop. Candidate microprocessor emulation approaches are outlined.