... one-digit sum and a possible carry. There isa carry if and only if the first number is a 1 and the second number is a 1; in other words, the carry is simply the AND of the two addends, while the ... 8088 and progressing through the 80286, 80386, and 80486. The so-called “x86 series” became the basis for the best-selling IBM personal computers (PCs and their clones) and is probably the most ... controller of the com-puter, as well as the place where all calculations are performed. And, of course, it’s the part of the computer that everyone talks and writes about—a 3.60-GHz Pentium 4 computer, ...