-IO_ACK trigger in edge, not in state (better in some scrolling...)
-WAIT_n generator ignoring M1 while IO_ACK

In OSD :
-CRTC0 or CRTC1, detected as it by WakeUp! demo. CRTC1 by default.
-MEM_wr : quick and slow. quick by default.

quick : Arkanoid II, Prehistoric II. Ecole demo. Pinball Dreams
slow : Saboteur 2. Still Rising demo.
