I have set up linux and am going to try advancemame.
I have a Wells Gardner d9200. When i run advcfg it asks for the values: Horz Active, Horz Front Porch, Horz Sync, Horz Back Porch, Vert Active, Vert Front Porch, Vert Sync, Vert Back Porch
Does anyone know what these values are?

I am sure I am not the first to use a d9200 with advmame but I couldn't find these values doing a search or looking at wells documentation.
thanks