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-rw-r--r--src/mess/machine/plus4user.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/src/mess/machine/plus4user.c b/src/mess/machine/plus4user.c
index 76dfbb061fb..12dd6aa0548 100644
--- a/src/mess/machine/plus4user.c
+++ b/src/mess/machine/plus4user.c
@@ -94,3 +94,12 @@ WRITE_LINE_MEMBER( plus4_user_port_device::dtr_w ) { if (m_cart != NULL) m_cart-
WRITE_LINE_MEMBER( plus4_user_port_device::rts_w ) { if (m_cart != NULL) m_cart->plus4_rts_w(state); }
WRITE_LINE_MEMBER( plus4_user_port_device::rxc_w ) { if (m_cart != NULL) m_cart->plus4_rxc_w(state); }
WRITE_LINE_MEMBER( plus4_user_port_device::atn_w ) { if (m_cart != NULL) m_cart->plus4_atn_w(state); }
+
+
+//-------------------------------------------------
+// SLOT_INTERFACE( plus4_user_port_cards )
+//-------------------------------------------------
+
+SLOT_INTERFACE_START( plus4_user_port_cards )
+ SLOT_INTERFACE("diag264", DIAG264_USER_PORT_LOOPBACK)
+SLOT_INTERFACE_END