ok. I managed to find a Dino Trivia screen (god, I always hated this game! ;)). the effect in MESS looks as follows (with pseudo-hires implemented):

[Linked Image from mamedev.emulab.it]

definitely close to the image byuu posted some time ago

[Linked Image from img35.imageshack.us]

(left: tv/bsnes, right: emu with no pseudo-hires, bottom: emu with pseudo-hires)