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Hi Stew and John Thank you for your advices. For the moment, I can't reduce the oscillation which causes the vertical lines by putting caps on the power supplies near the 6847 circuit. I will carry on my investigations. My two Dragon RGB have the same behaviour. In RGB output, the vertical lines are...

Thank you Stew for all thoses precious advices, I will look at the power supply. I have taken a picture of the screen with the bars. And also a view of the Y signal given by IC 6847 compared with the Video Clock (oscillo at 0,2 µS per division) When I read the 6847 data sheet, in the case of a 14,21...

My motherboard is like this one. https://archive.worldofdragon.org/images/c/cb/Dragon_32_PCB_Top_%28PN41503_Issue3%29.jpg We can see on the picture that the 8 x OKI M3732H RAMs have the caps. and also that caps have been added, by exemple near the 6809. I don't understand what you mean by "The board...

RGB tests I have tested the RGB on the Scart input of different LCD TVs. It gives a nice picture, but with vertical lines. However, there are 2 things to fix (see schematics for explainations) : - the voltage at pin 16 of the Scart is too low to switch the RGB ; if not corrected, you could only get...

Hello. I have got two Dragon RGB SECAM and I think I'm not the only one here. The motherboard PN 41503 (issue 2 and issue 2A for me) and the SECAM PSU board PN 41504 are already in the hardware section. The quartz frequency is 14,2180 MHz. This machine has two interesting properties : - a RGB circui...

Hello, I have tried Xroar 0.36 with W10. It seems that the axis of my PC joystick are inverted. Though it was correct with the former versions. To jump with my lunar patrol, I have now to turn my stick left. I tried this in the conf file but not sure it's good ? joy joy0 joy-axis 0=physical:0,-1 joy...

To go and return from full screen, F11 and alt F are good !
Thanks.