Subject:
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Re: Digicomp II
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Newsgroups:
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lugnet.technic
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Date:
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Sun, 16 Dec 2007 12:51:40 GMT
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Viewed:
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11543 times
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In lugnet.technic, Alexander Holroyd wrote:
> > http://www.youtube.com/watch?v=SYi9sJkS19Q
>
> Congratulations Brian, this is truly astonishing!
I'd love to claim full credit, but I really have to say I never would have
thought this was possible until I had read about the original. The patent for
the original Digi-comp II is really interesting - the one patent contains the
idea for both DCII & a related device that got marketed as "Dr Nim" (it played
Nim using binary ball logic - I've not built that one yet, but it should be much
easier).
> I think I am beginning to understand how some
> of it works...
Good - then putting together a video and working in all that text & narration
was worth it :).
> ...What does the lower layer do? Is it just
> concerned with 2's complementing and clearing
> the accumulator?
Essentially yes. If you watch the video at 4:55, you can see a ball flip the red
"L" gate to the left, dropping into a hole, and then the top gate of the
accumulator *just* visible at the bottom of the frame "jumps" a little. The ball
moves down under the accumulator, striking a lower one-sided gate on each bit to
reset them to the left. The next ball in the video drops through the hole over
the mode switches, & you can see the first one toggle there. Under the mode
switches are full flip-flops (although there's some alternatives I've thought
of, as really all the mode switches must move together, so there's no critical
need to toggle them independently).
--
Brian Davis
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Message has 1 Reply:
 | | Re: Digicomp II
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| (...) Quite so. But an all-LEGO implementation is still a remarkable achievement. The patent for (...) It would be great to see a version of Dr Nim too. This might also be more of a manageable project for those with limited time and resources! Then (...) (16 years ago, 10-Feb-08, to lugnet.technic)
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Message is in Reply To:
| | Re: Digicomp II
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| (...) understand how some of it works... What does the lower layer do? Is it just concerned with 2's complementing and clearing the accumulator? cheers, Alexander (17 years ago, 15-Dec-07, to lugnet.technic)
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