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-rw-r--r--src/mame/drivers/vertigo.cpp3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/mame/drivers/vertigo.cpp b/src/mame/drivers/vertigo.cpp
index f879a290bbf..bac7f540e39 100644
--- a/src/mame/drivers/vertigo.cpp
+++ b/src/mame/drivers/vertigo.cpp
@@ -131,11 +131,12 @@ MACHINE_CONFIG_START(vertigo_state::vertigo)
MCFG_CPU_PROGRAM_MAP(vertigo_map)
MCFG_CPU_PERIODIC_INT_DRIVER(vertigo_state, vertigo_interrupt, 60)
- MCFG_DEVICE_ADD("adc", ADC0808, 500000) // unknown clock
+ MCFG_DEVICE_ADD("adc", ADC0808, 24_MHz_XTAL / 30) // E clock from 68000
MCFG_ADC0808_EOC_FF_CB(WRITELINE(vertigo_state, adc_eoc_w))
MCFG_ADC0808_IN0_CB(IOPORT("P1X"))
MCFG_ADC0808_IN1_CB(IOPORT("P1Y"))
MCFG_ADC0808_IN2_CB(IOPORT("PADDLE"))
+ // IN3-IN7 tied to Vss
exidy440_audio(config);