Hi all. First Post! Does anyone know where I can find a comprehensive TTL Cook Book (Particularly interested in a chip called 555 Timer and I want to understand its capabilities)? Also looking for any workbench software (not sure exactly what it's called but allows you to design and simulate circuits with some built-in chips too). I bought a breadboard that came with a free disk with this software but I lost it. I like to gain practical insight while I study, which is also why I joined this forum, but my breadboard and the components I have have limitations when it comes to some topics. Thanks in advance.