8-bit acorn hardware • Re: RGB to HDMI using a Pi Zero and a small CPLD

I'm using a Dell monitor not sure of the model at the moment but can find out.

That would be useful - there have been a few other reports of issues with certain Dell monitors:
viewtopic.php?t=23738

I'm not sure we ever got to the bottom of that one.

There are a couple of things that can go wrong that result in a blank screen:
- outputting a 50Hz video signal to a monitor that only supports 60Hz
- outputting HDMI to a monitor that only supports DVI

What type of input are you using on the monitor? HDMI or DVI?

The firmware I've used is the latest stable from master/main although I also tried the latest from Dev but neither seemed to show any activity. I did try powering via USB with nothing else plugged in but saw no output.

Can you repeat this test with Ian's latest Beta66 release from here:
https://github.com/IanSB/RGBtoHDMI/releases

Make sure you reformat the SD card (at least delete all the old files) before unzipping the new release.

Dave

Statistics: Posted by hoglet — Mon Dec 29, 2025 8:41 am

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