diff --git a/source/Memory.cpp b/source/Memory.cpp
index 2483daf7..14bd34cb 100644
--- a/source/Memory.cpp
+++ b/source/Memory.cpp
@@ -816,7 +816,7 @@ static BYTE __stdcall IO_Cxxx(WORD programcounter, WORD address, BYTE write, BYT
 		if ((address >= APPLE_SLOT_BEGIN) && (address <= APPLE_SLOT_END))
 		{
 			const UINT uSlot = (address>>8)&0x7;
-			if (uSlot != 3)
+			if (IS_APPLE2 || uSlot != SLOT3)
 			{
 				if (ExpansionRom[uSlot])
 					IO_SELECT |= 1<<uSlot;
@@ -841,7 +841,7 @@ static BYTE __stdcall IO_Cxxx(WORD programcounter, WORD address, BYTE write, BYT
 		if (IO_SELECT && IO_STROBE)
 		{
 			// Enable Peripheral Expansion ROM
-			UINT uSlot=1;
+			UINT uSlot = SLOT1;
 			for (; uSlot<NUM_SLOTS; uSlot++)
 			{
 				if (IO_SELECT & (1<<uSlot))
@@ -907,8 +907,8 @@ static BYTE __stdcall IO_Cxxx(WORD programcounter, WORD address, BYTE write, BYT
 		const UINT uSlot = (address>>8)&0x7;
 		const bool bPeripheralSlotRomEnabled = IS_APPLE2 ? true	// A][
 													     :		// A//e or above
-			  ( !SW_INTCXROM   &&					// Peripheral (card) ROMs enabled in $C100..$C7FF
-		      !(!SW_SLOTC3ROM  && uSlot == 3) );	// Internal C3 ROM disabled in $C300 when slot == 3
+			  ( !SW_INTCXROM   &&						// Peripheral (card) ROMs enabled in $C100..$C7FF
+		      !(!SW_SLOTC3ROM  && uSlot == SLOT3) );	// Internal C3 ROM disabled in $C300 when slot == 3
 
 		// Fix for GH#149 and GH#164
 		if (bPeripheralSlotRomEnabled && !IsCardInSlot(uSlot))	// Slot is empty
@@ -1001,7 +1001,7 @@ void RegisterIoHandler(UINT uSlot, iofunction IOReadC0, iofunction IOWriteC0, io
 	IORead[uSlot+8]		= IOReadC0;
 	IOWrite[uSlot+8]	= IOWriteC0;
 
-	if (uSlot == 0)		// Don't trash C0xx handlers
+	if (uSlot == SLOT0)		// Don't trash C0xx handlers
 		return;
 
 	//
diff --git a/source/Tfe/tfearch.cpp b/source/Tfe/tfearch.cpp
index fe27dd04..f0c42cbd 100644
--- a/source/Tfe/tfearch.cpp
+++ b/source/Tfe/tfearch.cpp
@@ -333,8 +333,13 @@ pcap_t * TfePcapOpenAdapter(const std::string & interface_name)
         }
 
         if (!found) {
+#if 1
+            // TC: Don't take the first adapter, as this could be any NIC (eg. WAN miniport, Bluetooth, loopback etc)
+            return NULL;
+#else
             /* just take the first adapter */
             TfePcapDevice = TfePcapAlldevs;
+#endif
         }
     }
 
@@ -361,7 +366,7 @@ pcap_t * TfePcapOpenAdapter(const std::string & interface_name)
         return NULL;
 	}
 
-    if(g_fh) fprintf(g_fh, "PCAP: Successfully opened adapter: '%s'\n", TfePcapDevice->name);
+    if(g_fh) fprintf(g_fh, "PCAP: Successfully opened adapter: '%s' (%s)\n", TfePcapDevice->name, TfePcapDevice->description);
 
     tfe_arch_enumadapter_close();
     return TfePcapFP;
diff --git a/source/Uthernet1.cpp b/source/Uthernet1.cpp
index 1c9707e3..b016b45a 100644
--- a/source/Uthernet1.cpp
+++ b/source/Uthernet1.cpp
@@ -37,6 +37,7 @@
 #include "Tfe/tfesupp.h"
 #include "Tfe/NetworkBackend.h"
 #include "Tfe/PCapBackend.h"
+#include "../Windows/Win32Frame.h"
 
 /* Makros for reading and writing the visible TFE register: */
 #define GET_TFE_8(  _xxx_ ) \
@@ -1017,6 +1018,13 @@ void Uthernet1::InitializeIO(LPBYTE pCxRomPeripheral)
     {
         RegisterIoHandler(m_slot, TfeIo, TfeIo, TfeIoCxxx, TfeIoCxxx, this, NULL);
     }
+    else
+    {
+        // Interface doesn't exist or user picked an interface that isn't Ethernet!
+        // . So setup as a "null" card: I/O reads from floating bus & writes go to null
+        RegisterIoHandler(m_slot, IO_Null, IO_Null, TfeIoCxxx, TfeIoCxxx, this, NULL);
+        Win32Frame::GetWin32Frame().FrameMessageBox("Reconfigure the Interface via 'Ethernet Settings'.", "Uthernet 1 interface isn't valid!", MB_ICONEXCLAMATION | MB_SETFOREGROUND);
+    }
 }
 
 void Uthernet1::Reset(const bool powerCycle)
diff --git a/source/Uthernet2.cpp b/source/Uthernet2.cpp
index d43e23e6..79be63d3 100644
--- a/source/Uthernet2.cpp
+++ b/source/Uthernet2.cpp
@@ -1469,7 +1469,7 @@ BYTE __stdcall u2_C0(WORD programcounter, WORD address, BYTE write, BYTE value,
 
 void Uthernet2::InitializeIO(LPBYTE pCxRomPeripheral)
 {
-    RegisterIoHandler(m_slot, u2_C0, u2_C0, nullptr, nullptr, this, nullptr);
+    RegisterIoHandler(m_slot, u2_C0, u2_C0, IO_Null, IO_Null, this, nullptr);
 }
 
 void Uthernet2::getMACAddress(const uint32_t address, const MACAddress * & mac)