Hello, I am new to electronics and have been reading as much as I can about the subject when time permits. I am doing a project to make an adapter to hook a ttl magnetic swipe reader to my computer via the gaming port. There are also plans to make an adapter that would allow you to connect it to the parrallel port. One of the components of the parrallel adapter is an octal buffer. I do not understand what this component does. Anyone?