dinetwork: don't transmit fcs

src/devices/machine/am79c90.cpp

@@ -482,7 +482,7 @@ void am7990_device_base::transmit()
 		}
 	}
 
-	send(buf, length);
+	send(buf, length, 4);
 }
 
 void am7990_device_base::send_complete_cb(int result)

src/devices/machine/dp83932c.cpp

@@ -393,7 +393,7 @@ void dp83932c_device::transmit()
 
 	// transmit data
 	dump_bytes(buf, length);
-	send(buf, length);
+	send(buf, length, 4);
 }
 
 void dp83932c_device::send_complete_cb(int result)

src/devices/machine/edlc.cpp

@@ -288,7 +288,7 @@ void seeq8003_device::transmit(void *ptr, int param)
 		dump_bytes(buf, length);
 
 		// transmit the frame
-		send(buf, length);
+		send(buf, length, 4);
 
 		// TODO: transmit errors/TxRET
 

src/devices/machine/i82586.cpp

@@ -1030,7 +1030,7 @@ bool i82586_device::cu_transmit(u32 command)
 		LOG("cu_transmit sending frame length %d\n", length);
 		dump_bytes(buf, length);
 
-		return send(buf, length) == length;
+		return send(buf, length, 4) == length;
 	}
 }
 

src/emu/dinetwork.cpp

@@ -28,7 +28,7 @@ void device_network_interface::interface_post_start()
 	device().save_item(NAME(m_loopback_control));
 }
 
-int device_network_interface::send(u8 *buf, int len)
+int device_network_interface::send(u8 *buf, int len, int fcs)
 {
 	// TODO: enable this check when other devices implement delayed transmit
 	//if (m_send_timer->enabled())
@@ -49,8 +49,10 @@ int device_network_interface::send(u8 *buf, int len)
 	}
 	else if (m_dev)
 	{
-		// send the data
-		result = m_dev->send(buf, len);
+		// send the data (excluding fcs)
+		result = m_dev->send(buf, len - fcs);
+		if (result)
+			result += fcs;
 	}
 
 	// schedule transmit complete callback

src/emu/dinetwork.h

@@ -23,7 +23,7 @@ public:
 	bool get_promisc() const { return m_promisc; }
 	int get_interface() const { return m_intf; }
 
-	int send(u8 *buf, int len);
+	int send(u8 *buf, int len, int fcs = 0);
 
 	// TODO: de-virtualise this when existing devices implement delayed receive
 	virtual void recv_cb(u8 *buf, int len);