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jbilander / Amiga_DB23_video_adapter

A PCB for creating Amiga SCART or Amiga VGA cables. You can also use this adapter to feed a new clock to the Amiga via XCLK making your machine true PAL/NTSC switchable
Creative Commons Attribution Share Alike 4.0 International
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Can you use this just to buffer as well? #3

Open ogg1e opened 2 years ago

ogg1e commented 2 years ago

What happens if you have this configured to be NTSC, and connect it to an NTSC amiga and monitor? Will it still work, or does it expect the machine and monitor to be opposite?

jbilander commented 2 years ago

Populating the crystal oscillator and the switch and U2 on the PCB is completely optional and not needed in order to make a VGA or SCART-cable. Leave out everything on the BOM XCLK if you don't want this feature. It is a nice feature to make your machine dual native mode NTSC/PAL. It's there to make it possible to run the Amiga from this external Oscillator rather than the internal one. If you put a NTSC-oscillator (28.63636 MHz) on here and the internal Oscillator in the Amiga is also 28.63636 MHz you will only switch between two oscillator with the same frequency so it doesn't make sense to do this. It will work but I don't see the point in doing this unless the internal oscillator is broken or malfunctioning. What the switch does is switching between Enabling/Disabling the external Oscillator feed. If you have a NTSC-Amiga then you have a 28.63636 MHz internally, now if you put a 28.37516 MHz (PAL) on the PCB you can now select between PAL/NTSC with a flick of a switch. The setup could also be vice versa of course, you have 28.37516 MHz internally and 28.63636 MHz externally on the PCB.