Can anyone give me a super dumbed-down explanation of how to operate this machine? If I understand the README correctly, it looks like the left 4 bits are the

Can anyone give me a super dumbed-down explanation of how to operate this machine? If I understand the README correctly, it looks like the left 4 bits are the instruction, and the right 4 bits are the address. So the line ---1--1- would mean "READ the value from address 0010 into the register". Is the correct interpretation? If so, how do I put a value onto the register in the first place? How I do I set the value at an address? Let's say I wanted to add 0001 + 0001 and show the output as 0010 on the printer. How would I do that?