Thanks Mike for that link, that brings back memories.
At high school 'Dag Hammarskjold ' in Assen N.L.(1980's) we had one PET 2000 computer for about 80 students. If you were lucky enough you could book ½ hour after school to have a play with it. The games we had were on cassette tape took 5 minutes to load, then verify and may be 10 minutes playing time. N.A.B. was then one of my favourite games.

Syntax error was no fun if it showed. [Linked Image]
usually ½ hour was over when game was working. The commodore 64 was a great machine too, amazing what you could do with 32 RAM memory.
Also listings of game programmes could be altered to change aspects of the game with PEEK and POKE commands and changing numbers around.

The product of rotation, excitation and flux produces electricty.