IK plus all the hidden message Easter eggs and nifty bits buried in the Commodore Amiga game
1Type in a range of three/four letter secret codes while playing and you can trigger certain hidden messages and incidental background animations. Periodically, the latter occur anyway, though it's possible to make them appear at will too. Oh, and everyone knows about t = drop trousers.
Footage shown is taken from the Commodore Amiga version... as if you couldn't guess.
In case you're curious, Intoto was once an independent computer shop in Nottingham that Archer Maclean visited to get his gaming fix. I might go through and see if I can explain the other references if I get chance... unless someone else wants to chime in and beat me to it? Feel free.
PDS stands for Personal Development System, an all-encompassing assembler, editor and debugger.