DIrect TMS9928 - GBS8200 YPbPr connection

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By tvalenca

Paladin (747)

Аватар пользователя tvalenca

30-09-2016, 17:55

hit9918 wrote:

What if you put the two OUTs on the same line?

it is no help, a line is not a disabled interrupt zone.

Aw bummer!

hit9918 wrote:

a second 9918 on another port could be coded with BASIC OUT. because it isnt touched by the interrupt handler.


By realpeterjack

Champion (417)

Аватар пользователя realpeterjack

07-10-2016, 00:06

It's been a long time since my last post here. Anyways...

DamnedAngel, I'm also interested in this. Have a look at the analog PCB schematics, below:

As you can see, the VDP output (blue) goes through at least some circuitry (red) before being sent to the mono connector (green), which would be equivalent to Y. I lack knowledge on analog electronics to understand these schematics, but I wonder if one should make three different copies of the red part, one for each component. I still have to verify this, but I strongly believe the P7 test point will give you Y, P10 will give you Pb, and P9 Pr.

In case you are able to verify this, please, post here your results.

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