The first one I owned and learned how to use was a Sinclair Spectrum Z80 - sometime around 1981. It was a clever design. The whole thing was housed in a black keyboard about the size of the one I'm using now, minus the RH one-third. You had to plug it in to a TV for a monitor and a tape cassette recorder for RAM. There was a small thermal printer available. It used a silver-coloured paper roll.
You could buy some proprietary software on cassettes but it came with a pretty good manual that taught you how to use Sinclair Basic. I was very proud of myself when I wrote a program for cost estimating steel structures. (This was in the days when I was a structural engineer / project manager).
I've probably still got that little machine somewhere. Hmmmm......:rolleyes: