Hi there,

I am trying to create a video board with two V9958 superimposed. From the V9938 Techinical Data Book it is hinted that it is possible, but no example is given, neither any further information provided. Does anyone know how to connect two V9958 to work in parallel? I am looking for the simpliest way to do that. I am sure a half dozen connections between both VDPs would do the trick....

I believe that the pins which would do the trick are: YS, HSYNC, CSYNC, DLCLK, XTAL, VRESET and HRESET.
Maybe:

CSYNC -> VRESET
HSYNC -> HRESET
DLCLK -> DLCLK

XTAL using the same clock generator

YS of the primary VDP controlling transparency.

Can someone confirm or correct me please.

Thanks...

Seems that you have missed this newspost some time ago...

Yes, I saw that. But the developer isn't releasing the info, and I have something different in mind. Too bad that Yamaha never published the whole information..