uhdl

In the mister branch of the repository, you've removed the sys directory. I would recommend against doing this as it makes compiling and using this code much more complicated. The MiSTer framework doesn't have a fixed "API" because they regularly add features (for example, commit fc3e01f changed the width of the VIDEO_ARX and VIDEO_ARY signals), so a given version of this core only supports the framework in its tree.