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Build your own calculator

Discussion in 'Electronic Basics' started by zeeming, Dec 5, 2005.

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  1. zeeming

    zeeming Guest

    Hello,
    I would like to build my own calculator. I am trying to build the mos
    basic calculator that can simply add and subtract (and maybe multiply an
    divide as well). What I am most interested in is the very heart of th
    calculator, the processor, so to speak. I am interested in learning abou
    how it works exactly so I can follow the path of each and every signal.
    Essentially, I would like to build this processor piece by piece fro
    scratch.

    My email is bbobbage at yahoo.com
     
  2. Rich Webb

    Rich Webb Guest

    I'd download the free ISE WebPACK from Xilinx
    <http://www.xilinx.com/ise/logic_design_prod/webpack.htm>
    or Altera's free Quartus II Web Edition
    <http://www.altera.com/products/software/products/quartus2web/sof-quarwebmain.html>

    which will let you build your design gate-by-gate and then run it under
    the enclosed simulation software. When it's time to make it "real world"
    there are several inexpensive FPGA development boards you can use. This
    is a much "nicer" alternative to wiring up a gazillion [*] discrete TTL
    logic gates (although that's also a possible route). There is a learning
    curve to creating a design via schematic layout in those packages but
    it's a heck of a lot less time than wire-wrapping or breadboarding a
    pile of discretes -- and you'll learn a useful tool in the process.

    There are many sources for dev boards. A favorite site is
    http://www.digilentinc.com/ where you can get boards and the
    necessary JTAG programming dongles.



    [*] Speaking of gazillion; shamelessly stolen from Blond Sense
    <http://blondesense.blogspot.com/2005/12/you-just-know-it-could-happen.html>

    Donald Rumsfeld is giving the President his daily briefing. He concludes
    by saying. "Yesterday 3 Brazilian soldiers were killed."

    "OH NO!" The President exclaims. "That's terrible!"

    His staff sits stunned at this display of emotion nerivously watching as
    the President sits, head in hands.

    Finally, the President looks up and ask. "How many is a Brazillion?"
     
  3. Bob Monsen

    Bob Monsen Guest

    This one made me laugh... Thanks!

    --
    Regards,
    Bob Monsen

    Man, as a social animal, can no more escape government than the
    individual can escape bondage to his bowels."
     
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