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External VDP input?


cph1776
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It should work (but I think pin 35 is grounded in the TI and would need to be disconnected). But the external signal and the VDP need to be sync locked together - details are in the 9918 datasheet. It's NOT just a case of connecting another video signal to pin 35.

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I tried back in the day, it's pretty tough to get it right. But yes, you need to cut the sync pin and add a circuit to feed external sync at a high voltage... even if you get all that right... there was an article in Radio Electronics long enough that suggested the TI default clock might be off by too much to sync nicely (but that I'm not sure).

 

I was able to switch back and forth between internal and external video, I just had trouble with syncing. :)

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