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Diffstat (limited to 'src/devices/bus/interpro/keyboard/keyboard.h')
-rw-r--r--src/devices/bus/interpro/keyboard/keyboard.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/devices/bus/interpro/keyboard/keyboard.h b/src/devices/bus/interpro/keyboard/keyboard.h
index 83347f17114..05c672a0ad7 100644
--- a/src/devices/bus/interpro/keyboard/keyboard.h
+++ b/src/devices/bus/interpro/keyboard/keyboard.h
@@ -46,7 +46,7 @@ class device_interpro_keyboard_port_interface : public device_slot_card_interfac
public:
// input lines
- virtual DECLARE_WRITE_LINE_MEMBER(input_txd) { }
+ virtual DECLARE_WRITE_LINE_MEMBER(input_txd) = 0;
DECLARE_WRITE_LINE_MEMBER(output_rxd) { m_port->m_rxd_handler(state); }
protected: