er..that was me
I have to admit it, I drew graphs!
The CPC464 was my first computer, but I had been lusting after even the zx80 when I first saw it advertised in an electronics mag. Sadly my parents had divorced & my Mum had to bring up 4 kids on her own with little support at the time from my Dad. Eventually one of my rich friends got given a zx81 (pre-built) we spent a few weeks together typing in programs & then he loaned it to me because I was fascinated with writing my own little programs on it ,whereas he just wanted to play games, but they weren't really up to much. The same thing happened with another friend's Spectrum.
Then one Christmas we got the green screen CPC464. Which must have been the reason we had been eating little more than rice for 6 months while Mum saved up for it!
As someone who has always been hopeless at arithmetic, I found on a computer numbers made much more sense & I finally got to grips with algebra. I spent my time writing programs, which drew graphs from my inputs (just like the faux 3d column graphs in the picture!). I wrote programs to help me learn my times tables, I wrote a stock market game, and the thing I was most proud of was writing a program that displayed a 3D globe (just line drawing) that I could rotate & change the perspective of.
So the CPC 464 turned my simple fascination for giving machines instructions into a dedicated hobby. Eventually I did a BSc in Software Engineering, but not until my late 20's. Now many of the worlds largest companies use software I have worked on. I doubt any of that would have happened without those few years coding on the CPC.
I loved that machine. I'm still crap at arithmetic though.