- directx can coexist older and newer version - mame hlsl needs directx 9 - run dxdiag - check which directx I have - MS provides directx redist https://docs.mamedev.org/advanced/hlsl.html HLSL Effects for Windows — MAME Documentation 0.261 documentation This defines how strong the effect of the shadowmask is. Acceptable range is from 0 to 1, where 0 will show no shadowmask effect, 1 will be a c..