Just a quick shot as it appears I have finally got the code for the Pandora graphics chip to work as intended. This is not running game code, I just grabbed the memory content for the colour and sprite registers and load it for testing, but after several false starts it is finally behaving itself. (I did have a previous version that worked and was much quicker, unfortunately it required about 80,000 LUTs)
Ignore the rows of numbers at the top of the screen, I used them for debugging things. The only important one is the 83, which shows that the screen was complete on the 131st vertical scan line, so plenty of room to manoeuvre for extra sprites.