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Programming the Propeller Microcontroller
Get the authoritative guide to the Parallax Propeller chip.
Lego Turing Machine
If you like Turing machines, check out this Lego version.
Turing Used Alternating Cells
Normally we see Turing machines that write numeric sequences where every cell is used. In Turing's paper he used only alternating cells for numeric sequences. The empty cells between were used to hold control or note symbols.