diff --git a/src/emu/cpu/mips/psx.c b/src/emu/cpu/mips/psx.c
index 33063f852f9..1e3c6559514 100644
--- a/src/emu/cpu/mips/psx.c
+++ b/src/emu/cpu/mips/psx.c
@@ -3301,7 +3301,7 @@ static void mips_get_info(UINT32 state, cpuinfo *info)
 		case CPUINFO_INT_DEFAULT_IRQ_VECTOR:			info->i = 0;							break;
 		case CPUINFO_INT_ENDIANNESS:					info->i = CPU_IS_LE;					break;
 		case CPUINFO_INT_CLOCK_MULTIPLIER:				info->i = 1;							break;
-		case CPUINFO_INT_CLOCK_DIVIDER:					info->i = 1;							break;
+		case CPUINFO_INT_CLOCK_DIVIDER:					info->i = 2;							break;
 		case CPUINFO_INT_MIN_INSTRUCTION_BYTES:			info->i = 4;							break;
 		case CPUINFO_INT_MAX_INSTRUCTION_BYTES:			info->i = 4;							break;
 		case CPUINFO_INT_MIN_CYCLES:					info->i = 1;							break;
diff --git a/src/mame/drivers/konamigq.c b/src/mame/drivers/konamigq.c
index a0b0af1981f..09104cf23f5 100644
--- a/src/mame/drivers/konamigq.c
+++ b/src/mame/drivers/konamigq.c
@@ -373,7 +373,7 @@ static MACHINE_RESET( konamigq )
 
 static MACHINE_DRIVER_START( konamigq )
 	/* basic machine hardware */
-	MDRV_CPU_ADD( PSXCPU, 33868800 / 2 ) /* 33MHz ?? */
+	MDRV_CPU_ADD( PSXCPU, XTAL_67_7376MHz / 2 )
 	MDRV_CPU_PROGRAM_MAP( konamigq_map, 0 )
 	MDRV_CPU_VBLANK_INT( psx_vblank, 1 )
 
diff --git a/src/mame/drivers/konamigv.c b/src/mame/drivers/konamigv.c
index 104c1342fbd..78b56711f5d 100644
--- a/src/mame/drivers/konamigv.c
+++ b/src/mame/drivers/konamigv.c
@@ -347,7 +347,7 @@ static const struct PSXSPUinterface konamigv_psxspu_interface =
 
 static MACHINE_DRIVER_START( konamigv )
 	/* basic machine hardware */
-	MDRV_CPU_ADD( PSXCPU, 33868800 / 2 ) /* 33MHz ?? */
+	MDRV_CPU_ADD( PSXCPU, XTAL_67_7376MHz / 2 )
 	MDRV_CPU_PROGRAM_MAP( konamigv_map, 0 )
 	MDRV_CPU_VBLANK_INT( psx_vblank, 1 )
 
diff --git a/src/mame/drivers/ksys573.c b/src/mame/drivers/ksys573.c
index 3429667cc54..e356fc0e608 100644
--- a/src/mame/drivers/ksys573.c
+++ b/src/mame/drivers/ksys573.c
@@ -2725,7 +2725,7 @@ static DRIVER_INIT( salarymc )
 
 static MACHINE_DRIVER_START( konami573 )
 	/* basic machine hardware */
-	MDRV_CPU_ADD( PSXCPU, 33868800 / 2 ) /* 33MHz ?? */
+	MDRV_CPU_ADD( PSXCPU, XTAL_67_7376MHz / 2 )
 	MDRV_CPU_PROGRAM_MAP( konami573_map, 0 )
 	MDRV_CPU_VBLANK_INT( sys573_vblank, 1 )
 
diff --git a/src/mame/drivers/namcos10.c b/src/mame/drivers/namcos10.c
index 82fac579c17..ff4d11af5fe 100644
--- a/src/mame/drivers/namcos10.c
+++ b/src/mame/drivers/namcos10.c
@@ -377,7 +377,7 @@ static MACHINE_RESET( namcos10 )
 
 static MACHINE_DRIVER_START( namcos10 )
 	/* basic machine hardware */
-	MDRV_CPU_ADD( PSXCPU, 33868800 / 2 ) /* 33MHz ?? */
+	MDRV_CPU_ADD( PSXCPU, XTAL_100MHz / 2 )
 	MDRV_CPU_PROGRAM_MAP( namcos10_map, 0 )
 	MDRV_CPU_VBLANK_INT( psx_vblank, 1 )
 
diff --git a/src/mame/drivers/namcos11.c b/src/mame/drivers/namcos11.c
index 01c51ac8bcb..2df95259c8b 100644
--- a/src/mame/drivers/namcos11.c
+++ b/src/mame/drivers/namcos11.c
@@ -896,7 +896,7 @@ NAMCO_C7X_HARDWARE
 
 static MACHINE_DRIVER_START( coh100 )
 	/* basic machine hardware */
-	MDRV_CPU_ADD( PSXCPU, 33868800 / 2 ) /* 33MHz ?? */
+	MDRV_CPU_ADD( PSXCPU, XTAL_67_7376MHz / 2 )
 	MDRV_CPU_PROGRAM_MAP( namcos11_map, 0 )
 	MDRV_CPU_VBLANK_INT( namcos11_vblank, 1 )
 
diff --git a/src/mame/drivers/namcos12.c b/src/mame/drivers/namcos12.c
index 64595fe1c81..7c8bb258321 100644
--- a/src/mame/drivers/namcos12.c
+++ b/src/mame/drivers/namcos12.c
@@ -1496,7 +1496,7 @@ static DRIVER_INIT( golgo13 )
 
 static MACHINE_DRIVER_START( coh700 )
 	/* basic machine hardware */
-	MDRV_CPU_ADD( PSXCPU, 33868800 / 2 ) /* 33MHz ?? */
+	MDRV_CPU_ADD( PSXCPU, XTAL_100MHz / 2 )
 	MDRV_CPU_PROGRAM_MAP( namcos12_map, 0 )
 	MDRV_CPU_VBLANK_INT( psx_vblank, 1 )
 
diff --git a/src/mame/drivers/zn.c b/src/mame/drivers/zn.c
index 7a54a28ea2b..38a841ce5d4 100644
--- a/src/mame/drivers/zn.c
+++ b/src/mame/drivers/zn.c
@@ -621,7 +621,7 @@ static const struct QSound_interface qsound_interface =
 
 static MACHINE_DRIVER_START( coh1000c )
 	/* basic machine hardware */
-	MDRV_CPU_ADD( PSXCPU, 33868800 / 2 ) /* 33MHz ?? */
+	MDRV_CPU_ADD( PSXCPU, XTAL_67_7376MHz / 2 )
 	MDRV_CPU_PROGRAM_MAP( zn_map, 0 )
 	MDRV_CPU_VBLANK_INT( psx_vblank, 1 )
 
@@ -664,7 +664,7 @@ MACHINE_DRIVER_END
 
 static MACHINE_DRIVER_START( coh1002c )
 	/* basic machine hardware */
-	MDRV_CPU_ADD( PSXCPU, 33868800 / 2 ) /* 33MHz ?? */
+	MDRV_CPU_ADD( PSXCPU, XTAL_67_7376MHz / 2 )
 	MDRV_CPU_PROGRAM_MAP( zn_map, 0 )
 	MDRV_CPU_VBLANK_INT( psx_vblank, 1 )
 
@@ -873,7 +873,7 @@ static MACHINE_RESET( coh3002c )
 
 static MACHINE_DRIVER_START( coh3002c )
 	/* basic machine hardware */
-	MDRV_CPU_ADD( PSXCPU, 33868800 / 2 ) /* 33MHz ?? */
+	MDRV_CPU_ADD( PSXCPU, XTAL_67_7376MHz / 2 )
 	MDRV_CPU_PROGRAM_MAP( zn_map, 0 )
 	MDRV_CPU_VBLANK_INT( psx_vblank, 1 )
 
@@ -1314,7 +1314,7 @@ static const struct YM2610interface ym2610_interface =
 
 static MACHINE_DRIVER_START( coh1000ta )
 	/* basic machine hardware */
-	MDRV_CPU_ADD( PSXCPU, 33868800 / 2 ) /* 33MHz ?? */
+	MDRV_CPU_ADD( PSXCPU, XTAL_67_7376MHz / 2 )
 	MDRV_CPU_PROGRAM_MAP( zn_map, 0 )
 	MDRV_CPU_VBLANK_INT( coh1000t_vblank, 1 )
 
@@ -1421,7 +1421,7 @@ static NVRAM_HANDLER( coh1000tb )
 
 static MACHINE_DRIVER_START( coh1000tb )
 	/* basic machine hardware */
-	MDRV_CPU_ADD( PSXCPU, 33868800 / 2 ) /* 33MHz ?? */
+	MDRV_CPU_ADD( PSXCPU, XTAL_67_7376MHz / 2 )
 	MDRV_CPU_PROGRAM_MAP( zn_map, 0 )
 	MDRV_CPU_VBLANK_INT( coh1000t_vblank, 1 )
 
@@ -1611,7 +1611,7 @@ static MACHINE_RESET( coh3002t )
 
 static MACHINE_DRIVER_START( coh3002t )
 	/* basic machine hardware */
-	MDRV_CPU_ADD( PSXCPU, 33868800 / 2 ) /* 33MHz ?? */
+	MDRV_CPU_ADD( PSXCPU, XTAL_67_7376MHz / 2 )
 	MDRV_CPU_PROGRAM_MAP( zn_map, 0 )
 	MDRV_CPU_VBLANK_INT( psx_vblank, 1 )
 
@@ -1825,7 +1825,7 @@ static MACHINE_RESET( coh1000w )
 
 static MACHINE_DRIVER_START( coh1000w )
 	/* basic machine hardware */
-	MDRV_CPU_ADD( PSXCPU, 33868800 / 2 ) /* 33MHz ?? */
+	MDRV_CPU_ADD( PSXCPU, XTAL_67_7376MHz / 2 )
 	MDRV_CPU_PROGRAM_MAP( zn_map, 0 )
 	MDRV_CPU_VBLANK_INT( psx_vblank, 1 )
 
@@ -2067,7 +2067,7 @@ static const struct YMF271interface ymf271_interface =
 
 static MACHINE_DRIVER_START( coh1002e )
 	/* basic machine hardware */
-	MDRV_CPU_ADD( PSXCPU, 33868800 / 2 ) /* 33MHz ?? */
+	MDRV_CPU_ADD( PSXCPU, XTAL_67_7376MHz / 2 )
 	MDRV_CPU_PROGRAM_MAP( zn_map, 0 )
 	MDRV_CPU_VBLANK_INT( psx_vblank, 1 )
 
@@ -2412,7 +2412,7 @@ static MACHINE_RESET( coh1000a )
 
 static MACHINE_DRIVER_START( coh1000a )
 	/* basic machine hardware */
-	MDRV_CPU_ADD( PSXCPU, 33868800 / 2 ) /* 33MHz ?? */
+	MDRV_CPU_ADD( PSXCPU, XTAL_67_7376MHz / 2 )
 	MDRV_CPU_PROGRAM_MAP( zn_map, 0 )
 	MDRV_CPU_VBLANK_INT( psx_vblank, 1 )
 
@@ -2579,7 +2579,7 @@ static MACHINE_RESET( coh1001l )
 
 static MACHINE_DRIVER_START( coh1001l )
 	/* basic machine hardware */
-	MDRV_CPU_ADD( PSXCPU, 33868800 / 2 ) /* 33MHz ?? */
+	MDRV_CPU_ADD( PSXCPU, XTAL_67_7376MHz / 2 )
 	MDRV_CPU_PROGRAM_MAP( zn_map, 0 )
 	MDRV_CPU_VBLANK_INT( psx_vblank, 1 )
 
@@ -2668,7 +2668,7 @@ static INTERRUPT_GEN( coh1002v_vblank )
 
 static MACHINE_DRIVER_START( coh1002v )
 	/* basic machine hardware */
-	MDRV_CPU_ADD( PSXCPU, 33868800 / 2 ) /* 33MHz ?? */
+	MDRV_CPU_ADD( PSXCPU, XTAL_67_7376MHz / 2 )
 	MDRV_CPU_PROGRAM_MAP( zn_map, 0 )
 	MDRV_CPU_VBLANK_INT( coh1002v_vblank, 1 )
 
@@ -2937,7 +2937,7 @@ static const struct YMZ280Binterface ymz280b_intf =
 
 static MACHINE_DRIVER_START( coh1002m )
 	/* basic machine hardware */
-	MDRV_CPU_ADD( PSXCPU, 33868800 / 2 ) /* 33MHz ?? */
+	MDRV_CPU_ADD( PSXCPU, XTAL_67_7376MHz / 2 )
 	MDRV_CPU_PROGRAM_MAP( zn_map, 0 )
 	MDRV_CPU_VBLANK_INT( psx_vblank, 1 )
 
@@ -2969,7 +2969,7 @@ MACHINE_DRIVER_END
 
 static MACHINE_DRIVER_START( coh1002msnd )
 	/* basic machine hardware */
-	MDRV_CPU_ADD( PSXCPU, 33868800 / 2 ) /* 33MHz ?? */
+	MDRV_CPU_ADD( PSXCPU, XTAL_67_7376MHz / 2 )
 	MDRV_CPU_PROGRAM_MAP( zn_map, 0 )
 	MDRV_CPU_VBLANK_INT( psx_vblank, 1 )
 
@@ -3011,7 +3011,7 @@ MACHINE_DRIVER_END
 
 static MACHINE_DRIVER_START( coh1002ml )
 	/* basic machine hardware */
-	MDRV_CPU_ADD( PSXCPU, 33868800 / 2 ) /* 33MHz ?? */
+	MDRV_CPU_ADD( PSXCPU, XTAL_67_7376MHz / 2 )
 	MDRV_CPU_PROGRAM_MAP( zn_map, 0 )
 	MDRV_CPU_VBLANK_INT( psx_vblank, 1 )