diff --git a/src/mame/drivers/model2.cpp b/src/mame/drivers/model2.cpp
index 6ede8e3b408..e3a0fa299ce 100644
--- a/src/mame/drivers/model2.cpp
+++ b/src/mame/drivers/model2.cpp
@@ -2454,7 +2454,7 @@ static ADDRESS_MAP_START( drive_io_map, AS_IO, 8, model2_state )
 ADDRESS_MAP_END
 
 static MACHINE_CONFIG_FRAGMENT( sj25_0207_01 )
-	MCFG_CPU_ADD("drivecpu", Z80, 16000000/4) //???
+	MCFG_CPU_ADD("drivecpu", Z80, XTAL_8MHz/2) // confirmed
 	MCFG_CPU_PROGRAM_MAP(drive_map)
 	MCFG_CPU_IO_MAP(drive_io_map)
 	MCFG_CPU_VBLANK_INT_DRIVER("screen", model2_state,  irq0_line_hold)