There are replicas but there may also be differences because of the large amount of human effort required to build one. I saw a replica complete with wire-wrapp

There are replicas but there may also be differences because of the large amount of human effort required to build one. I saw a replica complete with wire-wrapping over a decade ago. This technology looks very foreign to any recent computer engineer. As such, the more practical approach is to write software that can validate most commands you would send. I wonder what level of emulation they have achieved (if any) on modern hardware.