My first computer was also a Sinclair ZX81 with 16K of RAM. I wanted a ZX-80 earlier, but couldn’t afford it.
Later I bought the Memopak 64K expansion… and lusted for the Memopak HRG (High-Res Graphics) add-on, which I think was 192 by 140 or something pixels. These days we have icons that are bigger than that.
Later I lusted for the Sinclair Spectrum, which could run ZX81 programs, and in colour!!! Then there were the Sinclair QL, the Commodore 64, the Atari ST, none of which I could afford, being a Starving Student [sup]TM[/sup] and all. Still later, after getting my first after-school job, I saved up 1800 dollars and bought an Amiga.
I still have the ZX81. It’s right here on my desk. When the PC is turned off, it looks like the ZX81 has been connected to a 17-inch monitor. I’m now wondering how many hundreds of times faster than real life a 2-GHz PC could emulate the Z-80 in the ZX-81…