What was the game and on what pc? (from eighties)?

Question

when i was at lower school (around '89) we used to play this old game on a pc, all i can remember is that it had a witch in a castle, and i think you had to answer questions. it was very basic although didnt seem it then!) and i think the 'graphics' were mainly black, purple and bright green. Does anyone else remember this????

Answer 1

Castle Quest ? on the BBC?

http://www.nvg.ntnu.no/bbc/doc/games/Cas...

Answer 2

they had computers back then?

Answer 3

Heroes Quest. ?