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2 years ago It's possible there have been changes to the DVG support in advance mame.
I initially designed this hardware to work with the the Jun 25, 2020 version of Advance Mame, and I haven't updated it to handle anything newer. Once I got my USB-DVG I stopped working on this.
https://github.com/amadvance/advancemame/commits/master/advance/osd/dvg.c
You could try going back to that version and building it, or altering the Open-DVG code to handle the advance mame changes that have occurred since then.
Hello, I am sorry my question concerns your VST repository and moreover it is not an issue I think. I modified my V.ST board with Teensy3.2 with your modified firmware from your VST repository. The test screen I see OK, but I can´t make the Advance MAME work OK. I am trying the AdvanceMAME (Windows version) from here: https://drive.google.com/drive/folders/1KNNcKDJn_mh87HGbJHj9IvhJUWHlr3CX and also linux version from here: https://github.com/amadvance/advancemame . In the advmame.rc I have this items vector_aux_renderer dvg ("none" tried also), vector_aux_renderer_dual_display yes, vector_aux_renderer_port \.\COM14 . . I think it should work but not. If I start advmame with disconnected VST, I see game on the PC normally, when VST connected, advmame stucks with black screen on PC. By the way, speed of the serial is set the same in the firmware and in the USB properties. Do you think my setting is OK and the error probably shouldn´t be in the firmware, advmame.rc or version of the AdvanceMAME? Thank you very much for eventual answer and for your DVG modification as well. Tomas