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: 2010/5/25 09:32, local time: 2010/9/2 21:43,
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