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BitstuffFor people interested in how computers work bottom-up. Friday, February 09, 2007. Subtract and Branch if Negative. After thinking up a few different ideas, I finally remembered another project that I've been wanting to do: build a Subtract and Branch if Negative computer. That is, a computer whose only instruction is to subtract two numbers, store the result, and branch to an alternative memory location if the result is negative. This is very much like SBN. Instruction Set: Subtract and Branch if Negative.
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