TL:DR; 2x2 for kids
2x2 for kids
A simulation of a NYC Transit Authority train traveling by automatic signals with working stop arms. Working circuit drawings show how the signal system relays function while the train passes over track circuits.
The program suggests most interesting guessing with a technique of ancient Chinese hexagrams!
Book inventory software for allows book collectors, hobbyists, book clubs, small private or public libraries to organize, catalog, and manage their collections on their PCs.