Cool! Why exactly did it take so long BTW? (not complaining, just curious about the hard parts). Although the first computer I've used was a ZX Spectrum I was too young to program it at the time and have never had time to actually revisit it later. About a decade later (that was the epoch of Windows XP and Ubuntu already) I had a dream of running Visual Basic 1.0 for DOS on it, developing text-mode pseudographical winforms-like apps (clones of Total Commander and Excel :-)). Ever since then I have been passively curious about whether it actually is hard or not and why nobody actually tries this (isn't the GUI alone actually a fairly easy thing every computer can manage as long as we give up all the eye-candy effects and accept the fact actual calculations on data are going to be fairly slow?). Cool to see people have implemented something like this actually and have even done it in graphics rather than in just pseudo. Also, why can't we use modern languages like Python or their subsets to write Z80 programs, at least very simple ones?