diff --git a/src/devices/bus/hp9845_io/98035.cpp b/src/devices/bus/hp9845_io/98035.cpp
index 8ed82e39cb9..061d42158a5 100644
--- a/src/devices/bus/hp9845_io/98035.cpp
+++ b/src/devices/bus/hp9845_io/98035.cpp
@@ -154,7 +154,7 @@ hp98035_io_card::~hp98035_io_card()
 }
 
 static INPUT_PORTS_START(hp98035_port)
-	MCFG_HP9845_IO_SC(1)
+	MCFG_HP9845_IO_SC(9)
 INPUT_PORTS_END
 
 ioport_constructor hp98035_io_card::device_input_ports() const