diff --git a/USBHost.h b/USBHost.h
index f082801..3f32ecd 100644
--- a/USBHost.h
+++ b/USBHost.h
@@ -239,8 +239,10 @@ protected:
 	void poweron(uint32_t port);
 	void getstatus(uint32_t port);
 	void clearstatus(uint32_t port);
+	void reset(uint32_t port);
 	static void callback(const Transfer_t *transfer);
 	void status_change(const Transfer_t *transfer);
+	void new_port_status(uint32_t port, uint32_t status);
 	void update_status();
 	setup_t setup;
 	uint8_t hub_desc[16];
@@ -251,7 +253,9 @@ protected:
 	uint8_t state;
 	Pipe_t *changepipe;
 	uint32_t changebits;
-	uint32_t status;
+	uint32_t statusbits;
+	uint16_t portstatus[7];
+	uint8_t  portstate[7];
 };
 
 
diff --git a/ehci.cpp b/ehci.cpp
index b6672b3..5f13d66 100644
--- a/ehci.cpp
+++ b/ehci.cpp
@@ -751,7 +751,7 @@ static bool allocate_interrupt_pipe_bandwidth(uint32_t speed, uint32_t maxlen,
 	maxlen = (maxlen * 76459) >> 16; // worst case bit stuffing
 	if (speed == 2) {
 		// high speed 480 Mbit/sec
-		uint32_t stime = (55 + 32 + maxlen) >> 5;
+		uint32_t stime = (55 + 32 + maxlen) >> 5; // time units: 32 bytes or 533 ns
 		uint32_t min_offset = 0xFFFFFFFF;
 		uint32_t min_bw = 0xFFFFFFFF;
 		for (uint32_t offset=0; offset < interval; offset++) {
@@ -788,6 +788,8 @@ static bool allocate_interrupt_pipe_bandwidth(uint32_t speed, uint32_t maxlen,
 		// full speed 12 Mbit/sec or low speed 1.5 Mbit/sec
 		uint32_t stime, ctime;
 		if (direction == 0) {
+			// TODO: how much time to SSPLIT & CSPLIT actually take?
+			// they're not documented in 5.7 or 5.11.3.
 			stime = (100 + 32 + maxlen) >> 5;
 			ctime = (55 + 32) >> 5;
 		} else {
@@ -795,6 +797,8 @@ static bool allocate_interrupt_pipe_bandwidth(uint32_t speed, uint32_t maxlen,
 			ctime = (70 + 32 + maxlen) >> 5;
 		}
 		interval = interval >> 3; // can't be zero, earlier check for interval >= 8
+		// TODO: should we take Single-TT hubs into account, avoid
+		// scheduling overlapping SSPLIT & CSPLIT to the same hub?
 		uint32_t min_shift = 0;
 		uint32_t min_offset = 0xFFFFFFFF;
 		uint32_t min_bw = 0xFFFFFFFF;
diff --git a/hub.cpp b/hub.cpp
index 8d91ccc..08ba847 100644
--- a/hub.cpp
+++ b/hub.cpp
@@ -74,6 +74,8 @@ bool USBHub::claim(Device_t *dev, int type, const uint8_t *descriptors)
 	changepipe = NULL;
 	changebits = 0;
 	state = 0;
+	memset(portstatus, 0, sizeof(portstatus));
+	memset(portstate, 0, sizeof(portstate));
 
 	mk_setup(setup, 0xA0, 6, 0x2900, 0, sizeof(hub_desc));
 	queue_Control_Transfer(dev, &setup, hub_desc, this);
@@ -94,7 +96,7 @@ void USBHub::getstatus(uint32_t port)
 	} else {
 		mk_setup(setup, 0xA3, 0, 0, port, 4); // get port status
 	}
-	queue_Control_Transfer(device, &setup, &status, this);
+	queue_Control_Transfer(device, &setup, &statusbits, this);
 }
 
 void USBHub::clearstatus(uint32_t port)
@@ -107,6 +109,13 @@ void USBHub::clearstatus(uint32_t port)
 	queue_Control_Transfer(device, &setup, NULL, this);
 }
 
+void USBHub::reset(uint32_t port)
+{
+	mk_setup(setup, 0x23, 3, 4, port, 0); // set feature PORT_RESET
+	queue_Control_Transfer(device, &setup, NULL, this);
+}
+
+
 void USBHub::control(const Transfer_t *transfer)
 {
 	Serial.println("USBHub control callback");
@@ -148,8 +157,7 @@ void USBHub::control(const Transfer_t *transfer)
 			clearstatus(0);
 			return;
 		  case 0x000000A3: // get port status
-			Serial.print("New Port Status, port=");
-			Serial.println(setup.wIndex);
+			new_port_status(setup.wIndex, statusbits);
 			clearstatus(setup.wIndex);
 			return;
 		  case 0x00100120: // clear hub status
@@ -194,6 +202,55 @@ void USBHub::update_status()
 	}
 }
 
+void USBHub::new_port_status(uint32_t port, uint32_t status)
+{
+	if (port < 1 || port > 7) return;
+	uint32_t priorstatus = portstatus[port - 1];
+	portstatus[port] = status;
+
+	Serial.print("New Port Status, port=");
+	Serial.print(port);
+	Serial.print(", status=");
+	Serial.println(status, HEX);
+
+	// status bits, USB 2.0: 11.24.2.7.1 page 427
+	if (status & 0x0001) Serial.println("  Device is present: ");
+	if (status & 0x0002) {
+		Serial.println("  Enabled, speed = ");
+		if (status & 0x0200) {
+			Serial.print("1.5");
+		} else {
+			if (status & 0x0400) {
+				Serial.print("480");
+			} else {
+				Serial.print("12");
+			}
+		}
+		Serial.println(" Mbit/sec");
+	}
+	if (status & 0x0004) Serial.println("  Suspended");
+	if (status & 0x0008) Serial.println("  Over-current");
+	if (status & 0x0010) Serial.println("  Reset");
+	if (status & 0x0100) Serial.println("  Has Power");
+	if (status & 0x0800) Serial.println("  Test Mode");
+	if (status & 0x1000) Serial.println("  Software Controls LEDs");
+
+	if ((status & 0x0001) && !(priorstatus & 0x0001)) {
+		Serial.println("    connect");
+		// 100 ms debounce (USB 2.0: TATTDB, page 150 & 188)
+		delay(100);  // TODO: horribly bad... need timing events
+		reset(port);
+		// TODO... reset timer?
+
+	} else if (!(status & 0x0001) && (priorstatus & 0x0001)) {
+		Serial.println("    disconnect");
+
+
+	}
+
+}
+
+
 void USBHub::disconnect()
 {
 	// TODO: free resources