Labs

Lab 7.3: Toward Arithmetic

Logg-O Help

If we are to build a computer out of Logg-O-like circuits, we had better be able to do some computing with them - and we can! The circuits described below take an (admittedly small) step toward illustrating how logical gates can be combined to simulate arithmetic.

  1. Use Logg-O to build a 1-bit half adder using AND, OR, and NOT gates, as described in figure 7.7 of your text. Test it using all possible combinations of inputs.

  2. Use Logg-O's "Save as..." button to save your circuit in a file named "halfadd.dat"

  3. Add to your half adder circuit the gates and connections necessary to implement a one-bit full adder, as depicted in figure 7.8 in your text. After testing your full adder, save it as "fulladd.dat".

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