I'm developing testing rom, to make fast checks of vdp emulation.
WARNING: use this rom at your own risk. Only if you crazy. Mindless, or if you don't care.
It is rapidly changes the display mode. I don't know what will be with MD.
I'm not sure about right VDP behavior, so It's needs approval.
Here it is: http://elektropage.ru/r57shell/vdp_tests.bin
About last two tests: is it works same on hardware as is in Kega Fusion or RetroArch?
Interesting note: first test always crash BizHawk if you start rewind.
![Smile :)](./images/smilies/icon_smile.gif)
Update: one test fixed, one test added.