I am reminded of these drop-in replacements for a hardware CPU, implemented in software on the Teensy microcontroller platform: https://microcorelabs.wordpress

I am reminded of these drop-in replacements for a hardware CPU, implemented in software on the Teensy microcontroller platform: https://microcorelabs.wordpress.com https://microcorelabs.wordpress.com Cycle-accurate emulation with appropriate electrical connections and pinout make it a fully compatible software implementation of the original hardware CPU.