Believe it or not, 4 NAND gates can add a pair of binary numbers and find the sum. The only trick is that the binary numbers must be very small... Only one digit each. This adder can add 0+0=0, 0+1=1, 1+0=1, and 1+1=2. If you try to add even 0+2, it will fail to give the right output. But as with many things in digital logic, we can set many of these little adders side by side and make one that can do just about any size number. That is next, for now, look at how this works:
Isn't that cool!
| file: /techref/logic/add1.htm, 1KB, , updated: 2008/12/29 19:00, local time: 2009/11/21 23:01,
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 Peter Todd has released source and sample projects for his artwork, including his 3d wireframe cube renderer for the PIC 18f6520 This includes examples of hardware developed with free software tools such as gEDA/gschem/PCB, SDCC, gputils and picp all on Linux. http://petertodd.ca/art/source-code/ |
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