The Scalextric C7005 Digital Chip (also known as Chip A) is an in-car microprocessor module used to convert standard analog Scalextric cars (non-DPR) to work on Scalextric Digital layouts. It is specifically designed to fit most F1-style and single-seater cars due to its compact size. Key Features and Compatibility Function: The chip adds digital capabilities, allowing cars to be raced on digital track layouts with features such as lane changing (with appropriate track pieces). Installation: Conversion requires hobbyist skills and tools, including a soldering iron, as the chip must be hardwired into the car's motor and pickup braids. Car Types: It is the designated "retro-fit" chip for most standard non-DPR (Digital Plug Ready) cars produced from 1957 to approximately 2007. Scale: It is designed for 1:32 scale slot cars. Motor Compatibility: It can handle motors up to around 21,500 rpm, as long as excessive magnets aren't used, according to user reviews on eBay. Alternative for DPR Cars: For cars marked as "Digital Plug Ready" (DPR), the easy-fit digital plugs (C8515 for standard cars or C8516 for F1 cars) should be used instead, as they require no soldering.