The in-car microprocessor module allows the conversion of a standard Scalextric car to work on Scalextric Digital layouts. C7005 Chip A is designed to fit most F1 style cars. Some F1 cars chassis produced between 2004 and 20076 have mounting points for this specific chip. C7006 Chip B is designed to fit most saloon style cars. Some saloon car chassis produced between 2004 to 2007 have mounting points for this specific chip. However, either can be used if room inside the car body permits. Most Scalextric cars, from 1957 to current date, can be converted to digital operation. The conversion requires hobbyist skills and some tools including a soldering iron.