As a teenager in the 80's I was a user of the TK82C, a Brazilian clone of the Sinclair ZX81 computer. Today, as a retrocomputing hobbyist, I'm still making use of the ZX81 creating programs just for fun.
More about ZX81 and brazilian clones at my website: http://zx81.eu5.org/
Kind regards,
Kelly Abrantes Murta