Yep, I can remember doing that on a CBM 3016 in secondary school - must have been about 1979. A little later this 'thing' arrived that comprised a keyboard in a large, plain grey case with a micro-cassette drive, permanently hooked up to a domestic TV by a large umbilical cord. A group of us were given some information booklets and told to 'see what we could do with it'. We later found out it was a prototype for the BBC micro and further code updates allowed us to select teletext pages on the TV and go to 'special' pages that downloaded code to the micro-cassette. We wrote a lot of simple games and apps for the beast.