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My evenings lately have been learning how to divide an 8 bit value by 10. Simple on the surface—but doing it using z80 asm (which would be equally tricky with 6502 asm). That's to say: you have shifts, add, sub but no native divide or multiplication (assuming I'm not using z80n)
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It's one of those fascinating deep dives into real work involved to do things that come easy to humans (divide by 10 : "just" move the decimal place).