I posted some videos to YouTube of a few games and also a small BASIC program to demonstrate the acceleration achieved when running the MCLZ8 is the maximum acceleration mode.

When using acceleration mode-3 which operates both RAM and ROM entirely inside of the Teensy and is accessed at 800Mhz, the total CPU speedup appears to be between 15x and 20x over the stock Z80! This is with “number crunching” only and not performing any video accesses which would slow down the CPU due to the video memory being located on the motherboard.

Video of Donkey Kong under NewDOS: https://www.youtubecom/watch?v=AHEyADtfJ3U

Video of Zaxxon under NewDOS: https://www.youtube.com/watch?v=NqiwF3rjT58

Video of Acceleration Demonstration under TRSDOS: https://www.youtube.com/watch?v=0iaphw76k6Q

I should have described the acceleration modes are in the videos, so ill correct that here:

Mode 0 – All external memory accesses
Mode 1 – Reads and writes are cycle accurate using internal memory with writes passing through to motherboard
Mode 2 – Reads accelerated using internal memory and writes are cycle accurate and pass through to motherboard
Mode 3 – All read and write accesses use accelerated internal memory