Chap mines Bitcoin with PUNCH CARDS and ancient mainframe

IBM Model 1401 can hash, will produce a Bitcoin some time after the Sun explodes

Vintage hardware enthusiast Ken Shirriff has shown that a model 1401 mainframe, which IBM announced in 1959, can mine Bitcoin. If, that is, your definition of mining includes "chugging away at the problem until pretty close to the heat-death of the universe.""