Subject:
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Re: Rotating through a four-bit nibble
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 22 Sep 2005 10:37:14 GMT
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Reply-To:
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Geoffrey Hyde <gdothyde@bigponddotnet/Spamless/dotau>
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Viewed:
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2231 times
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"Jordan Bradford" <bradfj23REMOVE_THIS_SPAM_THINGY@uwosh.edu> wrote in
message news:In7A20.1sK1@lugnet.com...
> In lugnet.robotics, Kevin L. Clague wrote:
> Why in the world wouldn't the firmware support shifting? The hardware
> <http://www.delorie.com/gnu/docs/binutils/as_236.html certainly does>.
>
> Heh, using multiply and divide to simulate shifting is kind of backwards.
The problem is, multiplication and division to a binary CPU, as is the case
here, is just a whole series of instructions.
Here is the basic principle explained, partway down the page:
http://www.evergreen.edu/biophysics/technotes/misc/bin_math.htm
A link to binary addition and subtraction, from HowStuffWorks article on
binary (it's actually a framed link to a different site, may have to cut out
the frame addition if it doesn't work properly), note how it essentially
works the same as decimal multiplication/division - also partway down the
page.
http://computer.howstuffworks.com/framed.htm?parent=bytes.htm&url=http://www.math.grin.edu/~rebelsky/Courses/152/97F/Readings/student-binary.html
Hope this helps you understand it better! :)
--
Cheers ...
Geoffrey Hyde
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Message has 1 Reply:
 | | Re: Rotating through a four-bit nibble
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| (...) Understand what better? Binary math? No problems with that! By "backwards" I meant that multiplication and division by powers of 2 are usually changed to shift L/R by compilers. Also, I am amused that because the firmware doesn't use the (...) (19 years ago, 22-Sep-05, to lugnet.robotics, FTX)
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