Hello,
I was poking around with my Pioneer PX-1 (PAL version) and discovered a way to overscan the VDP.
For the ones who does not know this model, I will tell that it is capable of superimpose on a (composite video) image source connected to it.
Basically, the way that it works, is that the sync signals are extracted from the composite video in and inyected to VDP chip (I think this one is a TMS9929a).
After that, VDP adjusts its own syncs to the external ones, overlaps the computer graphics and shows the external video in the areas where color 0 is shown.
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