CS 202 - Notes 2018-11-14
Making an adder/subtractor
In class, we walked through the construction of the four bit, two's compliment adder subtractor.
The big message here is how we continue to use abstraction on the hardware side. We used transistors to create gate level abstractions. We used gates to build a half adder. We used half adders to create full adders, and then we used full adders to make our ripple carry adder.
We also spent a little time learning a bit about Logisim, which will be our simulator for the next few weeks.
Here is the adder that we created in class. It is zipped so that your web browser doesn't get confused when it downloads the file.