3 ms·
From my experience (lost of Z80, much lesser 6502, but still some), it's mostly the indirect addressing modes - The Z80 had lousy IX/IY indexed access, and dire
by beagle3 6y ago
From my experience (lost of Z80, much lesser 6502, but still some), it's mostly the indirect addressing modes - The Z80 had lousy IX/IY indexed access, and direct HL/DE/BC access. The 6502 had great indirect access through X and Y.
So when manipulating memory (which is .. most of the time), The Z80 often needed 3-4 instructions for what the 6502 could do in one. The z80 had more registers and some 16-bit arithmetic.