diff --git a/src/mame/drivers/superchs.c b/src/mame/drivers/superchs.c
index 6751685db22..d40b411e3a2 100644
--- a/src/mame/drivers/superchs.c
+++ b/src/mame/drivers/superchs.c
@@ -328,11 +328,11 @@ static const tc0480scp_interface superchs_tc0480scp_intf =
 static MACHINE_CONFIG_START( superchs, superchs_state )
 
 	/* basic machine hardware */
-	MCFG_CPU_ADD("maincpu", M68EC020, XTAL_32MHz/2)
+	MCFG_CPU_ADD("maincpu", M68EC020, XTAL_40MHz/2) /* 20MHz - verified */
 	MCFG_CPU_PROGRAM_MAP(superchs_map)
 	MCFG_CPU_VBLANK_INT_DRIVER("screen", superchs_state,  irq2_line_hold)
 
-	MCFG_CPU_ADD("sub", M68000, XTAL_32MHz/2)
+	MCFG_CPU_ADD("sub", M68000, XTAL_32MHz/2) /* 16MHz - verified */
 	MCFG_CPU_PROGRAM_MAP(superchs_cpub_map)
 	MCFG_CPU_VBLANK_INT_DRIVER("screen", superchs_state,  irq4_line_hold)