My first computer.

To give an idea of the state of computing back then, the manual states (I checked now)

> to get '+' you must hold down the key SHIFT and while you are still doing that, press the key K.

Not something you find in user manuals now.

My English was so bad back them that I couldn't understand the full meaning of the sentence and I couldn't go through the example. I asked my classmates at school the day after. My mother was a touch typist but she didn't realize that the tiny keyboard of the ZX81 could work like the one of a typewriter. Computers were beyond geeky.