Turing machine - Wikipedia

computer science - What's a Turing machine? - Stack Overflow

Excel Turing Machine – Felienne Hermans

Turing Tumble - Wikipedia

Bombe - Wikipedia

File:State diagram 3 state busy beaver 2 .JPG - Wikipedia

File:State diagram 3 state busy beaver 2 .JPG - Wikipedia

Front of bombe code-breaking machine at Bletchley Park, UK, 1943 wikipedia.org/wiki/Bombe

Alan Turing - Chessprogramming wiki

Pushdown automaton - Wikipedia