diff -Nru oldsrc/src/mame/drivers/airbustr.c newsrc/src/mame/drivers/airbustr.c
--- oldsrc/src/mame/drivers/airbustr.c	2011-10-13 14:03:48.000000000 +0200
+++ newsrc/src/mame/drivers/airbustr.c	2011-10-13 17:49:52.000000000 +0200
@@ -564,8 +564,8 @@
 	if(scanline == 240) // vblank-out irq
 		cputag_set_input_line_and_vector(timer.machine(), "master", 0, HOLD_LINE, 0xfd);
 
-	/* Pandora "sprite end dma" irq? TODO: timing is clearly off, attract mode relies on this */
-	if(scanline == 64)
+	/* Pandora "sprite end dma" irq? */
+	if(scanline == 224)
 		cputag_set_input_line_and_vector(timer.machine(), "master", 0, HOLD_LINE, 0xff);
 }
 
@@ -652,8 +652,8 @@
 	MCFG_CPU_IO_MAP(sound_io_map)
 	MCFG_CPU_VBLANK_INT("screen", irq0_line_hold)		// nmi are caused by sub cpu writing a sound command
 
-	MCFG_QUANTUM_TIME(attotime::from_hz(6000))	// Palette RAM is filled by sub cpu with data supplied by main cpu
-							// Maybe a high value is safer in order to avoid glitches
+	MCFG_QUANTUM_PERFECT_CPU("master")	// Palette RAM is filled by sub cpu with data supplied by main cpu
+
 	MCFG_MACHINE_START(airbustr)
 	MCFG_MACHINE_RESET(airbustr)
 	MCFG_WATCHDOG_TIME_INIT(attotime::from_seconds(3))	/* a guess, and certainly wrong */