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Diffstat (limited to 'src/mame/drivers/groundfx.cpp')
-rw-r--r--src/mame/drivers/groundfx.cpp4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/mame/drivers/groundfx.cpp b/src/mame/drivers/groundfx.cpp
index 7a43f78930b..a9d95e2a663 100644
--- a/src/mame/drivers/groundfx.cpp
+++ b/src/mame/drivers/groundfx.cpp
@@ -246,8 +246,8 @@ MACHINE_CONFIG_START(groundfx_state::groundfx)
MCFG_DEVICE_ADD("adc", ADC0809, 500000) // unknown clock
MCFG_ADC0808_EOC_FF_CB(INPUTLINE("maincpu", 5))
- MCFG_ADC0808_IN0_CB(NOOP) // unknown
- MCFG_ADC0808_IN1_CB(NOOP) // unknown (used to be labeled 'volume' - but doesn't seem to affect it
+ MCFG_ADC0808_IN0_CB(CONSTANT(0)) // unknown
+ MCFG_ADC0808_IN1_CB(CONSTANT(0)) // unknown (used to be labeled 'volume' - but doesn't seem to affect it
MCFG_ADC0808_IN2_CB(IOPORT("WHEEL"))
MCFG_ADC0808_IN3_CB(IOPORT("ACCEL"))