https://github.com/harwoodr/logisim-dcpu16
http://www.cs.cornell.edu/courses/cs3410/2012sp/project/pa1.html
[The cs3410 Component Library]
http://www.cs.cornell.edu/courses/cs3410/2012sp/cs3410.jar

logisim alu
http://www.cs.cornell.edu/courses/cs3410/2019sp/logisim/components.html