# Fully universal Turing machine

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Fully universal Turing machine | ||

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View static image | ||

Pattern type | Miscellaneous | |
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Discovered by | Paul Rendell | |

Year of discovery | 2011 |

The **fully universal Turing machine** is an extension of Paul Rendell's universal Turing machine. Its tape is perfectly diagonal (instead of oblique), and the memory cells of the tape are continuously produced by two complex rake convoys. Rendell experimented with three different variants of this mechanism:

- A c/12 diagonal stack constructor using Cordership-based rakes (very large);
- A c/5 diagonal stack constructor using Matthias Merzenich's c/5 diagonal rakes;
- An expanding stack constructor comprising two perpendicular c/2 orthogonal convoys of rakes (the final version).

## See also

## External links

- A Fully Universal Turing Machine - Official site by Paul Rendell