The first parts that I purchased for my computer included two breadboards and the logic chips to build a simple Arithmetic Logic Unit that could preform addition and subtraction on 4 bits. Initially I was going to build a 4 bit computer, but I later decided that having a computer that could only operate with integers from 0 to 15 would be rather boring. I learned something very important with my first purchase: NTE chips are not meant for projects. NTE chips are fairly common if you are searching for cheap parts, and the reason behind that is that they are replacements for the real thing. I constructed my 4 bit full-adder and only got accurate output %20 of the time. The rest of the time the output remained erroneous.