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The VDP datasheet says: Note: Enabling bit 7 (actually bit 0/LSB) in the TMS9928A/9929A causes A-Y and B-Y to go to the sync level only when all planes in front of the pixel under question are transparent. I have no idea what they mean by this. The japanese games that goes out of sync on a PAL Sord ...

I had no picture on my MTX512, so I bought a new LM1889N chip for the video board. I now get a picture, but only black & white on the composite output (haven't checked the RF yet). I was looking at the schematic for the video board and noticed that there are a link which can be set in mode a or ...