We've all seen the stereotypical movie computer person. They watch a screen of binary scroll by, apparently interpeting it and making so much sense of it they only have to glance up every few seconds to figure out whats going on. Not gonna happen.
So you just bought that shiny new, or old, Macintosh and you're wondering how many stickers you can put on it before the sheer weight of the glue makes the case collapse. How many crumbs you can spill in the keyboard before the letter "J" refuses to move. How much dust can collect in your mouse before the little ball actually starts leaving a trail of dirt behind it when you move it.
[i]I recently had the pleasure of typesetting sixteen pages. These pages contained names, I.D. numbers, owners names/addresses, as well as several other pieces of data about dogs. After two days of deciphering non-standardized forms to find the information, I came to work expecting to fix any mistakes that had come up in the proof reading and opened the file.
Computers were designed as general purpose machines with the ability to do anything in the digital world that one can imagine. The standard configuration of a machine may not suit the mind of a creator or artist, so they'll add something to it. Their are many different types of boards available and they can fit into different types of slots. The type of slot dictates how many things work inside of a machine. The most common features are integrated onto a computer's motherboard but they are addressed virtually as if the functionality were an expansion card.