Page "Turing machine" Paragraph 11

Here, the internal state ( q < sub > 1 </ sub >) is shown inside the head, and the illustration describes the tape as being infinite and pre-filled with " 0 ", the symbol serving as blank.

The system's full state ( its configuration ) consists of the internal state, the contents of the shaded squares including the blank scanned by the head (" 11B "), and the position of the head.

( Drawing after Minsky ( 1967 ) p. 121 ).