This was my first home gaming system -
Black and white, a selection of Tennis, tennis single player, tennis against a wall, and some with barriers I think - all variations of black and white bouncing a group of pixels off a moving line.
Then the zx81 with a weird membrane keyboard.
Bought and upgraded a BBC B computer. Learned basic - which actually helped me later on.
Had a go of a school spectrum when they came out, but had to program it to sort out barcoded blocks and knock them into coloured bins as part of a CDT display to show off for open day. It actually worked!
Later I ended up programming the CNC mills and lathes while I was still an apprentice at an engineering plant, and at that time were still using punched paper tape to transfer programs. It was more reliable than magnetic media in that environment!
I never really took to playing games as an adult, but have had a go on the kids systems.