I spent many hours in http://www.cburch.com/logisim/ during my program doing the same thing. It was a great feeling to finally get a sub component correct and then copy it around in the next layer up.
yeah, that looks similar to the software I used. yes, and great feeling too, because I was in control of my design (only spec was it had to have at least 5 stages in pipeline). I remember the first time I got a program running. Felt really good.
jonnycomputer|4 years ago