Modifications and advice for Project 7 are listed here in reverse chronological order, with new additions at the top.
There is an important modification to this project: The calculator should be in Base 2. In other words, it should only have two numeric keys: 0 and 1. All of the math functions should be done in base 2. For example:
111 * 101 = 100011
(In Base 10, this would have been 7 * 5 = 35)1001 / 10 = 101
(In Base 10, this would have been 9 / 2 = 5)