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from the video it seems that the vertical signal is insufficient, there is something we are forgetting but I don't know what

I prefer the tricolor one, w Italy

this shows that I still have to learn with the drawing, I brought the decoupling capacitors closer, I increased the size of the copper hole on the diodes a little to facilitate soldering, I adapted the positions of the other components to make room, I await further suggestions :- )

hey I missed this, it's true a filter capacitor is missing, I'll add it to the correct scheme immediately!

R13=2,7k ohm c11=100nf

@daver2 and @Hugo Holden I read yours posts with great interest, I would like to have the card with me to be able to take measurements and see how it works live, I love all this, but I don't have your expertise. I am hungry for knowledge. @Desperado says: j2 hdrive and vdrive are reversed...

@daver2 I would like to include the names of all the participants on the silkscreen but I don't know your name, could you tell me, thanks

it's the old PCB, the connector was correct, I used that as a reference for the numbering but I corrected it with your indications.

I was also never sure about jp2, I checked and it was wrong then I redid it, I generated a new pdf where I used simple texts instead of dangerous tags, please check, thanks

aggiornamento schema e PCB completato

I created a new pcb changing the name to distinguish, the old one remains until debugging is finished

@daver2 these are the tracks to be cut, but the CAD asks to also connect D1, can you confirm?

removed the video tag, hvideo, vvideo, they are dangerous. the DRC program has recognized the errors but the PCB needs to be redesigned, I'll leave it for now so we can see what corrections need to be made

https://oshwlab.com/caradonna/pet64-video-board

I'm sorry but you're getting a crab as they say here in Italy, the crab pinches and doesn't let go. you are analyzing the PCB with low resolution images and you can't see well. I'll make the project public so you can see the details. The design rules and the DRC correction program works...

Guys, I looked at the first PCB and this j1 is the same, I made a mistake in writing the silk-screen numbering. however there is an error in j1 in the footprint which is upside down but it wasn't a problem in the previous PCB. The J2 connector is correct, in the past I thought it was a mistake...

this is gerber

thanks for the title, but I'm not a doctor, I'm a simple electronics technician who can carry out the instructions of an engineer but not competent in design

@daver2 @Hugo Holden the trimmers can be replaced with resistors very easily once the image is well centered, just read the value of the trimmer with a multimeter and look for the closest commercial ohm value

Add 100 ohm resistor