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Diffstat (limited to 'src/mame/drivers/m72.cpp')
-rw-r--r--src/mame/drivers/m72.cpp4
1 files changed, 1 insertions, 3 deletions
diff --git a/src/mame/drivers/m72.cpp b/src/mame/drivers/m72.cpp
index 67beb832f37..33139cd0aa6 100644
--- a/src/mame/drivers/m72.cpp
+++ b/src/mame/drivers/m72.cpp
@@ -194,7 +194,6 @@ other supported games as well.
#include "cpu/z80/z80.h"
#include "machine/irem_cpu.h"
#include "sound/ym2151.h"
-#include "sound/volt_reg.h"
#include "speaker.h"
@@ -1852,8 +1851,7 @@ static MACHINE_CONFIG_START( m72_audio_chips )
MCFG_SOUND_ROUTE(ALL_OUTPUTS, "speaker", 1.0)
MCFG_SOUND_ADD("dac", DAC_8BIT_R2R, 0) MCFG_SOUND_ROUTE(ALL_OUTPUTS, "speaker", 0.2) // unknown DAC
- MCFG_DEVICE_ADD("vref", VOLTAGE_REGULATOR, 0) MCFG_VOLTAGE_REGULATOR_OUTPUT(5.0)
- MCFG_SOUND_ROUTE_EX(0, "dac", 1.0, DAC_VREF_POS_INPUT) MCFG_SOUND_ROUTE_EX(0, "dac", -1.0, DAC_VREF_NEG_INPUT)
+ MCFG_SOUND_REFERENCE_INPUT(DAC_VREF_POS_INPUT, 1.0) MCFG_SOUND_REFERENCE_INPUT(DAC_VREF_NEG_INPUT, -1.0)
MACHINE_CONFIG_END
static MACHINE_CONFIG_START( m72_base )