With the two diodes reversed and a 910 Ohm resistor removed, a NOR gate is created. The next step was to build a S-R latch using the NAND gates and inverters, which holds some basic memory.

Complex applications use numerous NOT, AND, and OR gates, along with NAND, NOR, XOR, and XNOR gates. Logic Gates and Circuit Simplifcation Tutorial Video Credit: cslearning101 NAND logic gates serve ...