Before you plug in your new Timex/Sinclair 1000, please take a moment to think about this exciting new adventure. We want to assure you that:
1. You will enjoy computing.
2. You will find it easy as well as enjoyable.
3. You shouldn’t be afraid of the computer. You are smarter than it is. So is your parakeet, for that matter.
4. You will make mistakes as you learn. The computer will not laugh at you.
5. Your mistakes will not do any harm to the computer. You can’t break it by pushing the “wrong” button.
6. You are about to take a giant step into the future. Everyone will soon be using computers in every part of their daily lives, and you will have a head start.
-- Steve Vickers, Timex/Sinclair 1000 Instruction Manual (aka the US ZX81 manual)