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Max The Magnificent
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re: One-bit processor and a mega-cool Turing Machine
Max The Magnificent   3/12/2012 8:50:14 PM
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Do you know, I've been thinking about this in the back of my head all day ... but I don't want to do a straightforward copy of someone else's project ... how can I give it a "Twist of Max"?

David Ashton
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re: One-bit processor and a mega-cool Turing Machine
David Ashton   3/13/2012 9:54:25 AM
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There really was a one-bit processor...from Motorola: http://en.wikipedia.org/wiki/Motorola_MC14500B

chrisshore
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re: One-bit processor and a mega-cool Turing Machine
chrisshore   3/13/2012 11:28:38 AM
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I would have thought making one which manipulated beans rather than ball bearings would fit your column rather well!

Max The Magnificent
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re: One-bit processor and a mega-cool Turing Machine
Max The Magnificent   3/13/2012 12:48:40 PM
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Oooohhh -- that's a good one -- a "Cool Beans Turing Machine" .... hmmmm

Max The Magnificent
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re: One-bit processor and a mega-cool Turing Machine
Max The Magnificent   3/13/2012 12:52:17 PM
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Wow -- very interesting -- I found a website that has the data book on this for free download -- something to keep in reserve for the long cold nights next winter :-)

antedeluvian
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re: One-bit processor and a mega-cool Turing Machine
antedeluvian   3/13/2012 1:27:43 PM
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It actually isn't much fun to use if you're trying to make real product out of it. You need external hardware for the Program Counter and although it claims to be 1 bit, the instructions are 4 bits and only the data is one bit. Of course today you could use a FPGA for the external logic, but it would be a farce. I used 4000 series CMOS. I designed and was trying to sell a very low cost PLC. I probably have one or two if you are interested.

Max The Magnificent
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re: One-bit processor and a mega-cool Turing Machine
Max The Magnificent   3/13/2012 1:30:29 PM
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I meant to say that the instructions where 4 bits -- as you say, it didn't look like much fun to use -- when did this device come out (sometime in the 1970s)? If you have one going spare i would love it for my little collection

antedeluvian
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re: One-bit processor and a mega-cool Turing Machine
antedeluvian   3/13/2012 1:38:05 PM
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My data book (I scanned all of them) gives the copyright of 1977. Actually, surprisingly enough, we have an almost mint second edition in our library at work! I will scratch around at home to see if I still have and ICs.

antedeluvian
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re: One-bit processor and a mega-cool Turing Machine
antedeluvian   3/13/2012 2:07:50 PM
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The MC14500 popped up recently in Jack Ganssle's "Quirky Chips" edition of his "Break Points" Blog http://www.eetimes.com/discussion/break-points/4235428/Quirky-chips#post-comments

wswbln
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re: One-bit processor and a mega-cool Turing Machine
wswbln   3/13/2012 9:52:23 PM
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Yepp! There is one (date code 8134) in a drawer right in front of me (together with its IO-Chip 14599). :-)

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