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-rw-r--r--src/mame/drivers/karnov.cpp4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/mame/drivers/karnov.cpp b/src/mame/drivers/karnov.cpp
index 88e4321b409..0e265f1b1d8 100644
--- a/src/mame/drivers/karnov.cpp
+++ b/src/mame/drivers/karnov.cpp
@@ -849,6 +849,10 @@ static MACHINE_CONFIG_START( karnov, karnov_state )
MACHINE_CONFIG_END
static MACHINE_CONFIG_DERIVED( karnovjbl, karnov )
+ /* X-TALs:
+ Top board next to #9 is 20.000 MHz
+ Top board next to the microcontroller is 6.000 MHz
+ Bottom board next to the ribbon cable is 12.000 MHz*/
MCFG_CPU_MODIFY("audiocpu")
MCFG_CPU_PROGRAM_MAP(karnovjbl_sound_map)