Https://splintergu.itch.io/space-invaders-for-zx-spectrum-next
Sorry, I don't speak Greek... I don't know how to edit my post...
I am the author of this clone of space invaders... the code is from scratch... and it has all the behavior of the original arcade... sorry for answering in...
Ευχαριστώ πολύ!
Η τελευταία έκδοση του zx81 είναι πιο γρήγορη από το πρώτο βίντεο...
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Thanks! The last version is faster than this video
https://splintergu.itch.io/space-invaders-for-zx81-wrx
thanks!