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-rw-r--r--src/mame/drivers/marineb.cpp3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/mame/drivers/marineb.cpp b/src/mame/drivers/marineb.cpp
index fdea6da16c5..f04bccfe4df 100644
--- a/src/mame/drivers/marineb.cpp
+++ b/src/mame/drivers/marineb.cpp
@@ -42,6 +42,9 @@ write
#include "sound/ay8910.h"
#include "includes/marineb.h"
+#define MASTER_CLOCK (XTAL_12MHz)
+#define CPU_CLOCK (MASTER_CLOCK/4)
+#define SOUND_CLOCK (MASTER_CLOCK/8)
void marineb_state::machine_reset()
{