# How do Turing Tapes cause pixels on the screen to light up

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## 2 Replies - 1906 Views - Last Post: 25 June 2014 - 03:07 PM

### #1 leibniz76

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# How do Turing Tapes cause pixels on the screen to light up

Posted 25 June 2014 - 02:47 PM

I sort of understand how Turing Tapes work though I can't yet understand Turing's 1936 paper. Say you have a screen of pixels 1000 by 1000. How does a bit on a Turing Tape cause a certain pixel to light up on the screen? My guess would be that if you number the squares of a Turing Tape, so if square 502 has a 1 in it then pixel 443 x 567 lights up.
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## Replies To: How do Turing Tapes cause pixels on the screen to light up

### #2 modi123_1

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## Re: How do Turing Tapes cause pixels on the screen to light up

Posted 25 June 2014 - 03:03 PM

A Turing Tape is a hypothetical construct, right? So there are a multitude of ways to represent turning on a pixel for a screen. Each segment very well may correspond to a pixel location to be manipulated.

A cursory search yielded multiple explanations.

Example:
http://goanna.cs.rmi...ignment%202.pdf

### #3 macosxnerd101

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## Re: How do Turing Tapes cause pixels on the screen to light up

Posted 25 June 2014 - 03:07 PM

Moving to CS.

A Turing Tape is just a tape with cells. Each cell has a value. If you have a multitape TM, you can flatten it out as a single tape (meaning there is an equivalent single tape TM).

Compare this to a screen. It's a grid of pixels. Flatten that out to a single line of pixels. Each pixel represents a cell on the tape head of the TM. Pixel values are RGB color combinations. We represent each color as a distinct element in the alphabet. There is your equivalence.