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Summary

Description
English: Example of a 29-state read arm. The circuitry allows the series of quiescent south-pointing ordinary cells to be treated as bits storing information.

The animated gif was produced by a Java program (contact me for source code) the original cellular automaton pattern was created by Renato Nobili renato.nobili@pd.infn.it and lifted from the Golly simulator.

Read arm demo. Author: Renato Nobili <renato.nobili@pd.infn.it>

Controls are provided to direct the read arm (r-arm). Set the machine running at a slow speed to see it working.

A pulse on the input line (IN) causes the pattern to send one of two signal-trains down the output line (OUT), depending on the presence (1) or absence (0) of a mark on the tape at the current position. The reading head then moves forward, ready to read the next cell.

As with the construction arm, OTS (blue) and STS (red) lines work together to manipulate the cells at the end of the read arm. Various coders (C) and decoders (D) are used to send the required signal trains, which depend on the output of the read operation since the read head is left in one of two states.

Other controls (not shown) are needed to retract the read-arm.

http://www.pd.infn.it/~rnobili/wjvn/index.htm http://www.pd.infn.it/~rnobili/au_cell/ http://en.wikipedia.org/wiki/Von_Neumann_universal_constructor http://en.wikipedia.org/wiki/Von_Neumann_cellular_automata

Originally distributed as: RW-ARM_ADV.JVN

Redistributed with permission.
Date (UTC)
Source Own work
Author Simpsons contributor (talk)

Licensing

Public domain This work has been released into the public domain by its author, Simpsons contributor. This applies worldwide.

In some countries this may not be legally possible; if so:
Simpsons contributor grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.


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Transferred from en.wikipedia to Commons using For the Common Good.

The original description page was here. All following user names refer to en.wikipedia.
Date/Time Dimensions User Comment
08:29, 30 August 2009 1,157 × 602 (1,791,087 bytes) w:en:Simpsons contributor (talk | contribs) ()
06:06, 27 August 2009 1,157 × 602 (2,019,057 bytes) w:en:Simpsons contributor (talk | contribs) ({{Information |Description = Example of a 29-state read arm. The circuitry allows the series of quiescent south-pointing ordinary cells to be treated as bits storing information. A read arm is one of four parts essential to a von-Neumann universal con)

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Date/TimeThumbnailDimensionsUserComment
current20:00, 27 April 2013Thumbnail for version as of 20:00, 27 April 20131,157 × 602 (1.71 MB)OgreBot(BOT): Reverting to most recent version before archival
20:00, 27 April 2013Thumbnail for version as of 20:00, 27 April 20131,157 × 602 (1.93 MB)OgreBot(BOT): Uploading old version of file from en.wikipedia; originally uploaded on 2009-08-27 06:06:03 by Simpsons contributor
05:33, 26 April 2013Thumbnail for version as of 05:33, 26 April 20131,157 × 602 (1.71 MB)~rileyTransferred from en.wikipedia: see original upload log above

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