These models and simulations have been tagged “Binary-Adder”.

Andy Long
Spring, 2020 - Year of Covid-19​

Having constructed a working example of a finite state machine (FSM), from Gersting's 7th edition (p. 730, Example 29), I decided to create a more useful one -- a binary adder (p. 732). It works!

Subject to these rules:
1. Your two binary numbers should start off the same length -- pad with zeros if necessary. Call this length L.
2. Now pad your two binary numbers with three extra 0s at the end; this lets the binary-to-decimal conversion execute.
3. numbers are entered from ones place (left to right).
4. In Settings, choose "simulation start" as 1, your "simulation length" as L+2 -- two more than the length of your initial input number vectors. (I wish that the Settings issues could be set without having to explicitly change it each time -- maybe it can, but I don't know how.)

To understand why we need three additional inputs of 0s:
1. For the useless first piece of output -- so n -> n+1
2. For the possibility of adding two binary numbers and ending up with an additional place we need to force out: 111 + 111 = 0 1 1 1
3. For the delay in computing the decimal number: it reads the preceding output to compute the decimal value.

Andy Long
Spring, 2020 - Year of Covid-19​

Having constructed a working example of a finite state machine (FSM), from Gersting's 7th edition (p. 730, Example 29), I decided to create a more useful one -- a binary adder (p. 732). It works!

Subject to these rules:
1. Your two binary numbers should start off the same length -- pad with zeros if necessary. Call this length L.
2. Now pad your two binary numbers with three extra 0s at the end; this lets the binary-to-decimal conversion execute.
3. numbers are entered from ones place (left to right).
4. In Settings, choose "simulation start" as 1, your "simulation length" as L+2 -- two more than the length of your initial input number vectors. (I wish that the Settings issues could be set without having to explicitly change it each time -- maybe it can, but I don't know how.)