It is impossible to work with tools that you don't trust. Might be the compiler or might be not, but you have to use known good, reliable, tools. I understand from what you are saying that you usually develop on Linux and compiling on Windows might be a bit problematic for you. Use a VM to run Wind...

I think I used https://github.com/hartator/wayback-machine-downloader before, precisely to download a disappeared MSX website. Unfortunately not all files were downloaded, the original page looked more like an FTP site.

@ijor, are you going off the latest code in Github? I can jump in to help look at it as well, did RTL design professionally in a past life.

terriblefire wrote: ↑Mon May 17, 2021 1:57 pm The issue with this revision of the board and MSX2 is that it seems an RTC is required for MSX2. I'd not noticed that.

I'm fairly sure it isn't. My upgraded Expert almost certainly doesn't have an RTC. You can find the schematics to the upgrade kit here.

Great work, I'm excited to see what will come of this! MSX user since 1990 here. Two questions:

1. Which BIOS are you using here?
2. How are you handling cycles to the VDP for the turbo modes? Did you hook up the /WAIT signal?