Most of the CODIL research was carried out on mainframe computers which have long been retired from service, but in the early 1980s it was decided to produce a demonstration version, in the form of an educational package that would work on a BBC Micro - which was a popular hobby minicomputer which was used widely in schools and over 1.5 million were produced. The result was MicroCODIL. A large number of BBC microcomputers have survived (typically several are advertised at any one time on eBay) the package can still be run to demonstrate MicroCODIL and how it provides a transparent human-friendly framework.
