More Inside Joke than Three T.T.
Iq_132 of FBA fame pointed me that the right colors in Uncle Poo title screen can be found at color offsets 0x08-0x0f … after some further investigations I’ve found that there’s a 2-bit pal banking tied to the 0xb700 port. So, the tilemap has 8 independent color offset + two pal banks that allow it to select the whole 0x20 color offsets.
Speaking of pal banks, I’ve found it in Three Dealers Casino House, that gives a slight improvement for the 2$ dealer girl / 5$ dealer man color skin:
before
after
Last but not least, fixed for good trasparency issues in this game, after some exaustive dasm tracking that only indicated that the HW can do trasparency in any case if the pen has a value of 0: