The characters, ones and zeros, are written by the machine with a black dry erase marker. The tape in my machine is a 1000’ roll of white 35mm film leader. The machine works on, and knows about, only one cell at a time. It can read a cell determining what, if any, symbol is written there. The read-write head transports the tape and positions cells of the tape appropriately. The heart of the turing machine is the read-write head.
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