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-rw-r--r--src/devices/bus/vic20/exp.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/devices/bus/vic20/exp.cpp b/src/devices/bus/vic20/exp.cpp
index 535375536be..e70bda544bc 100644
--- a/src/devices/bus/vic20/exp.cpp
+++ b/src/devices/bus/vic20/exp.cpp
@@ -219,5 +219,6 @@ SLOT_INTERFACE_START( vic20_expansion_cards )
// the following need ROMs from the software list
SLOT_INTERFACE_INTERNAL("standard", VIC20_STD)
SLOT_INTERFACE_INTERNAL("ieee488", VIC1112)
+ MCFG_SLOT_OPTION_CLOCK("ieee488", DERIVED_CLOCK(1, 1))
SLOT_INTERFACE_INTERNAL("megacart", VIC20_MEGACART)
SLOT_INTERFACE_END