Lynysys

That is indeed, 100% what I was looking for... Kudos!

Hi Phareon - Thank you so much for adding the Custom Shader feature. I use Windows with "Inverted Colours" to reduce eye strain and wondered if you knew of similar shader that would "Invert Colours" for Altirra ? I have googled extensively and could not find a compatible shader that Altirra didn't complain about having syntax errors, so they may have been in the wrong shader format. Very many thanks- Lynysys.