The demoscene was first a spin-off the crackers and became an own culture with festivals, ‘jams’ and contests. Often there are old computers embeded. 

Demake is a ‘downsized’ game - a game developed for a ‘better platform’ (techincal) and was than recoded for an older vintage system. 

New software created for old obsolete hardware like in the demoscene or games on atari 2600 and so on.