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and to spend the last few spare hours I had, I have implemented MMC5 Extended Attribute Mode (Ex1), one of the many features of this pcb that were missing in MESS

It still does not make Castlevania 3 shine in its splendor, nor it makes the mapper suitable for promotion to working state (the real blocking bricks are the two sets of registers, depending on BG or sprite accesses, and the split screen setup), but at least it makes displaying something in the Koei games previously displaying only garbage