Ian McNaught-Davis has died at the age of 84.

Known affectionately by his friends as Mac, he was an accomplished mountaineer, television broadcaster, mathematician and computer expert. As part of the BBC's Computer Literacy Project, which first aired in 1979, he was the main presenter on more than 60 television programs.

"MAC was 'the man who knew about computers'," said David Allen, who was the editor of the BBC Computer Literacy Project between 1979 and 1987.

McNaught-Davis was diagnosed with Alzheimer's disease a few years ago and, more recently, liver cancer. He died on 8 February, at the age of 84.