diff --git a/src/mame/drivers/lasso.c b/src/mame/drivers/lasso.c
index e2deadd3c33..8399d1a713a 100644
--- a/src/mame/drivers/lasso.c
+++ b/src/mame/drivers/lasso.c
@@ -4,21 +4,22 @@
 
         driver by Phil Stroffolino, Nicola Salmoria, Luca Elia
 
----------------------------------------------------------------------------
-Year + Game                 By              CPUs        Sound Chips
----------------------------------------------------------------------------
+--------------------------------------------------------------------------------------
+Year + Game                 By              CPUs        Sound Chips         Misc Info
+--------------------------------------------------------------------------------------
 82  Lasso                   SNK             3 x 6502    2 x SN76489
 83  Chameleon               Jaleco          2 x 6502    2 x SN76489
 84  Wai Wai Jockey Gate-In! Jaleco/Casio    2 x 6502    2 x SN76489 + DAC
-84  Pinbo                   Jaleco          6502 + Z80  2 x AY-8910
----------------------------------------------------------------------------
+84  Pinbo                   Jaleco          6502 + Z80  2 x AY-8910         6502 @ 18MHz/24, Z80 @ 18MHz/6, AY @ 18MHz/12
+--------------------------------------------------------------------------------------
 
 Notes:
 
-- unknown CPU speeds (affect game timing), currently using same as the
-  Rock-Ola games of the same area.  Lot of similarities between these
-  hardware.  The music ends at the perfect time with this clock speed
+- unknown CPU speeds unless noted above (affect game timing), currently using
+  same as the Rock-Ola games of the same area.  Lot of similarities between
+  these hardware.  The music ends at the perfect time with this clock speed
 - Lasso: fire button auto-repeats on high score entry screen (real behavior?)
+- Pinbo: background color is wrong (MT #4546)
 
 ***************************************************************************
 
@@ -591,10 +592,11 @@ MACHINE_CONFIG_END
 static MACHINE_CONFIG_DERIVED( pinbo, base )
 
 	/* basic machine hardware */
-	MCFG_CPU_MODIFY("maincpu")
+	MCFG_CPU_REPLACE("maincpu", M6502, XTAL_18MHz/24)
 	MCFG_CPU_PROGRAM_MAP(pinbo_main_map)
+	MCFG_CPU_VBLANK_INT("screen", irq0_line_hold)
 
-	MCFG_CPU_REPLACE("audiocpu", Z80, 3000000)
+	MCFG_CPU_REPLACE("audiocpu", Z80, XTAL_18MHz/6)
 	MCFG_CPU_PROGRAM_MAP(pinbo_audio_map)
 	MCFG_CPU_IO_MAP(pinbo_audio_io_map)
 
@@ -611,10 +613,10 @@ static MACHINE_CONFIG_DERIVED( pinbo, base )
 	MCFG_DEVICE_REMOVE("sn76489.1")
 	MCFG_DEVICE_REMOVE("sn76489.2")
 
-	MCFG_SOUND_ADD("ay1", AY8910, 1250000)
+	MCFG_SOUND_ADD("ay1", AY8910, XTAL_18MHz/12)
 	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.55)
 
-	MCFG_SOUND_ADD("ay2", AY8910, 1250000)
+	MCFG_SOUND_ADD("ay2", AY8910, XTAL_18MHz/12)
 	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.55)
 MACHINE_CONFIG_END