I posted a video of an MCL65+ running the Brian’s Theme demo on an Apple II+

I believe this demo was distributed via cassette tape way back in 1979! I was able to load it onto my machine via this website by connecting my PC’s headphone output to the Apple’s cassette input: https://mirrors.apple2.org.za/Apple%20II%20Documentation%20Project/Software/Cassettes/

I first run the MCL65+ core in mode 1 which is 6502 cycle-accurate where each screen of the demo takes around 30 seconds. I then change to mode 2 acceleration which mirrors the computer’s memory with reads running accelerated and writes running cycle-exact while updating the computer’s memory. Basically, reads are accelerated and writes are cycle-accurate and pass through to the computer’s memory. I then change to mode 3 which uses mirrored memory and both reads and writes are accelerated!

I am changing acceleration modes using a series of keystrokes on the Apple II+ . I press left_arrow, right_arrow, left_arrow, then the number for the desired acceleration.

Here is a link to the video: https://youtu.be/7WuqLrW4Du0

And here is a link to the GitHub source code: https://github.com/MicroCoreLabs/Projects/tree/master/MCL65%2B