You might also want floooh's remix which has a nicer UI, with the ability to see instructions evaluated, modify memory, assemble/disassemble code, view traces,

You might also want floooh's remix which has a nicer UI, with the ability to see instructions evaluated, modify memory, assemble/disassemble code, view traces, etc. Visual 6502 remix: https://floooh.github.io/visual6502remix/ https://floooh.github.io/visual6502remix/ Visual Z80 remix: https://floooh.github.io/visualz80remix/ https://floooh.github.io/visualz80remix/