Penny's Computer Book (Reference)
Sure, Inspector Gadget was terrible at his job--but fortunately for him, he had a clever niece with a kickass COMPUTER BOOK to back him up (and, typically, save the day). As a kid, I'd pretend I had such a computer book--it could help me answer any question, solve any problem! Now that I have its real-world equivalent 25 years later, I've made some nostalgia-inspired wallpaper (and named my iPad "Penny").
The lock screen (shown top left) and home screen (top right) aren't *exactly* Penny's book, but they're very close to these stills I grabbed from YouTube. The user interface is, ah, interesting. Note the blue input jack: she had a cable to plug this thing into her … electric typewriter. Yup.