6502 and Apple 1 emulation

I couldn’t resist and re-used the architecture of my recent Z80 projects to make a 6502 and Apple 1 emulator. According to the Rugg/Feldman benchmarks, the emulator runs like a 1.8 MHz 6520 when running on the $0.15 CH32V006, such as the one in the $1.5 WeActStudio.CH32V00xCoreBoard.