Re: Rotating through a four-bit nibble

"Jordan Bradford" <[email protected]> wrote in 
message news:[email protected]...
> 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