Wasn't there a DirecTT or was that another name for the Medusa ?
As for the Milan, low res ST games don't run due to the lack of that resolution and probably other hardware incompatibilities.
It's a shame that no-one ever ported an ST emulator to the Milan.
Things like Doom ported by Patrice Mandin work ok but slowly. ScummVM runs too but I had a few problems with sound.