@wawrzon
You can promote most AGA modes (not HAM8) with ECS, a graphics board, P96 or CGX, and ModePro if intuition.library, graphics library, and layers.library functions are used. Any program that touches the hardware (e.g. the copper or blitter) will likely fail. Programs that write directly into their screen gfx/bitmap memory may work with planar bitmaps activated in ModePro. Most games hit the hardware and fail but a lot of Apps can have their AGA modes promoted.