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Thanks for the information about the diode, I was already thinking of putting a 1n4148 diode but you have confirmed it, I am not going to remove the vdg chip, since I have seen that it is already soldered on the board, I have an American tandy coco 2 and it has a socket and I had in Mind the one wit...

thanks pser1.

Greetings, thanks for reporting the bugs I had, especially the U3D buff would have toasted .. You are right in the part of the signal And that you have to take it after the multiplexer I have not realized it .. I rectify it .. what the friend robcfg comments, I do not put two physical vdg chips, but...

Thank you very much for publishing the missing information, I have already made the schematic and I intend to make a pcb and it will be signed by you as the author of the project. very grateful for your work.

Azerpy wrote: ↑Sun May 09, 2021 6:17 pm Here are the schematics.
circuit rvb.jpg

Greetings, could you complete the value of the resistors that has to be put, I would like to carry out tests to be able to make a pcb.

Greetings, my name is Alfredo and people in Spain know me better as retrocant. I have been in the retro world for more than 4 years and they have a good collection of 8, 16 and 32 bit microcomputer equipment. Already in the 90's I knew the dragon computer through computer science books and now I cur...