diff --git a/src/devices/machine/smpc.cpp b/src/devices/machine/smpc.cpp
index 6b7e0225dfa..6ce2e2f275f 100644
--- a/src/devices/machine/smpc.cpp
+++ b/src/devices/machine/smpc.cpp
@@ -364,11 +364,18 @@ TIMER_CALLBACK_MEMBER( saturn_state::stv_smpc_intback )
  - ID first controller, followed by the number of reads needed by the plugged controller
  - ID second controller, followed by the number of reads needed by the plugged controller
  - and so on... until the 4th (for SegaTap) or 6th (for Multitap) controller is read
+ TODO: how does the multitap check if a controller is connected? does it ask for the
+ controller status of each subport? how does this work exactly?
+ currently, there is a small problem in some specific controller config which seems to 
+ lose track of one controller. E.g. if I put multitap in port2 with inserted joy1, joy2 and joy4
+ it does not see joy4 controller, but if I put joy1, joy2, joy4 and joy5 it sees
+ all four of them. The same happens if I skip controllers with id = 0xff...
+ how did a real unit behave in this case?
 */
 
 TIMER_CALLBACK_MEMBER( saturn_state::intback_peripheral )
 {
-	//  if (LOG_SMPC) logerror("SMPC: providing PAD data for intback, pad %d\n", intback_stage-2);
+//  if (LOG_SMPC) logerror("SMPC: providing PAD data for intback, pad %d\n", intback_stage-2);
 	
 	// doesn't work?
 	//pad_num = m_smpc.intback_stage - 1;
diff --git a/src/mame/includes/stv.h b/src/mame/includes/stv.h
index fa11adbceb9..efe07c96c46 100644
--- a/src/mame/includes/stv.h
+++ b/src/mame/includes/stv.h
@@ -146,13 +146,6 @@ public:
 		UINT8 slave_on;
 	}m_smpc;
 
-	struct {
-		UINT8 status;
-		UINT8 data;
-		UINT8 prev_data;
-		UINT16 repeat_count;
-	}m_keyb;
-
 	/* Saturn specific*/
 	int m_saturn_region;
 	UINT8 m_cart_type;
@@ -682,12 +675,6 @@ public:
 	TIMER_CALLBACK_MEMBER( smpc_change_clock );
 	TIMER_CALLBACK_MEMBER( stv_intback_peripheral );
 	TIMER_CALLBACK_MEMBER( stv_smpc_intback );
-	void smpc_digital_pad(UINT8 pad_num, UINT8 offset);
-	void smpc_analog_pad(UINT8 pad_num, UINT8 offset, UINT8 id);
-	void smpc_keyboard(UINT8 pad_num, UINT8 offset);
-	void smpc_mouse(UINT8 pad_num, UINT8 offset, UINT8 id);
-	void smpc_md_pad(UINT8 pad_num, UINT8 offset, UINT8 id);
-	void smpc_unconnected(UINT8 pad_num, UINT8 offset);
 	TIMER_CALLBACK_MEMBER( intback_peripheral );
 	TIMER_CALLBACK_MEMBER( saturn_smpc_intback );
 	void smpc_rtc_write();