diff --git a/src/mame/includes/xbox.h b/src/mame/includes/xbox.h
index 58d7588fc62..8094ac33100 100644
--- a/src/mame/includes/xbox.h
+++ b/src/mame/includes/xbox.h
@@ -188,6 +188,29 @@ enum USBDescriptorType {
 	ENDPOINT=5
 };
 
+enum USBRequestType
+{
+	StandardType=0,
+	ClassType,
+	VendorType,
+	ReservedType
+};
+
+enum USBRequestRecipient
+{
+	DeviceRecipient=0,
+	InterfaceRecipient,
+	EndpointRecipient,
+	OtherRecipient
+};
+
+enum USBDeviceState
+{
+	DefaultState,
+	AddressState,
+	ConfiguredState
+};
+
 class ohci_function_device {
 public:
 	ohci_function_device(running_machine &machine);
@@ -198,11 +221,14 @@ private:
 	void add_configuration_descriptor(USBStandardConfigurationDescriptor &descriptor);
 	void add_interface_descriptor(USBStandardInterfaceDescriptor &descriptor);
 	void add_endpoint_descriptor(USBStandardEndpointDescriptor &descriptor);
+	int handle_nonstandard_request(USBSetupPacket *setup);
+	int state;
 	int address;
 	int newaddress;
 	int controldirection;
 	int controltype;
 	int controlrecipient;
+	int configurationvalue;
 	bool settingaddress;
 	int remain;
 	UINT8 *position;
diff --git a/src/mame/machine/xbox.cpp b/src/mame/machine/xbox.cpp
index bed1f2b01d9..3ff877d3a25 100644
--- a/src/mame/machine/xbox.cpp
+++ b/src/mame/machine/xbox.cpp
@@ -841,6 +841,7 @@ static USBStandardEndpointDescriptor enddesc02 = {7,5,0x02,3,0x20,4};
 
 ohci_function_device::ohci_function_device(running_machine &machine)
 {
+	state = DefaultState;
 	descriptors = auto_alloc_array(machine, UINT8, 1024);
 	descriptors_pos = 0;
 	address = 0;
@@ -848,6 +849,7 @@ ohci_function_device::ohci_function_device(running_machine &machine)
 	controldirection = 0;
 	controltype = 0;
 	controlrecipient = 0;
+	configurationvalue = 0;
 	remain = 0;
 	position = nullptr;
 	settingaddress = false;
@@ -861,25 +863,25 @@ ohci_function_device::ohci_function_device(running_machine &machine)
 void ohci_function_device::add_device_descriptor(USBStandardDeviceDescriptor &descriptor)
 {
 	memcpy(descriptors + descriptors_pos, &descriptor, sizeof(descriptor));
-	descriptors_pos += sizeof(descriptor);
+	descriptors_pos += descriptor.bLength;
 }
 
 void ohci_function_device::add_configuration_descriptor(USBStandardConfigurationDescriptor &descriptor)
 {
 	memcpy(descriptors + descriptors_pos, &descriptor, sizeof(descriptor));
-	descriptors_pos += sizeof(descriptor);
+	descriptors_pos += descriptor.bLength;
 }
 
 void ohci_function_device::add_interface_descriptor(USBStandardInterfaceDescriptor &descriptor)
 {
 	memcpy(descriptors + descriptors_pos, &descriptor, sizeof(descriptor));
-	descriptors_pos += sizeof(descriptor);
+	descriptors_pos += descriptor.bLength;
 }
 
 void ohci_function_device::add_endpoint_descriptor(USBStandardEndpointDescriptor &descriptor)
 {
 	memcpy(descriptors + descriptors_pos, &descriptor, sizeof(descriptor));
-	descriptors_pos += sizeof(descriptor);
+	descriptors_pos += descriptor.bLength;
 }
 
 void ohci_function_device::execute_reset()
@@ -890,9 +892,11 @@ void ohci_function_device::execute_reset()
 
 int ohci_function_device::execute_transfer(int address, int endpoint, int pid, UINT8 *buffer, int size)
 {
+	int descriptortype;// descriptorindex;
+
 	if (endpoint == 0) {
 		if (pid == SetupPid) {
-			struct USBSetupPacket *p=(struct USBSetupPacket *)buffer;
+			USBSetupPacket *p=(struct USBSetupPacket *)buffer;
 			// define direction 0:host->device 1:device->host
 			controldirection = (p->bmRequestType & 128) >> 7;
 			// case ==1, IN data stage and OUT status stage
@@ -901,9 +905,10 @@ int ohci_function_device::execute_transfer(int address, int endpoint, int pid, U
 			controltype = (p->bmRequestType & 0x60) >> 5;
 			controlrecipient = p->bmRequestType & 0x1f;
 			position = nullptr;
+			// number of byte to transfer in data stage (0 no data stage)
 			remain = p->wLength;
-			// if standard
-			if (controltype == 0) {
+			// if standard device request
+			if ((controltype == StandardType) && (controlrecipient == DeviceRecipient)) {
 				switch (p->bRequest) {
 				case GET_STATUS:
 				case CLEAR_FEATURE:
@@ -914,29 +919,39 @@ int ohci_function_device::execute_transfer(int address, int endpoint, int pid, U
 					settingaddress = true;
 					break;
 				case GET_DESCRIPTOR:
-					if ((p->wValue >> 8) == DEVICE) { // device descriptor
-						//p->wValue & 255;
+					descriptortype = p->wValue >> 8;
+					//descriptorindex = p->wValue & 255;
+					if (descriptortype == DEVICE) { // device descriptor
 						position = descriptors;
 						remain = descriptors[0];
 					}
-					else if ((p->wValue >> 8) == CONFIGURATION) { // configuration descriptor
+					else if (descriptortype == CONFIGURATION) { // configuration descriptor
 						position = descriptors + 18;
 						remain = descriptors[18+2];
 					}
-					else if ((p->wValue >> 8) == INTERFACE) { // interface descriptor
+					else if (descriptortype == INTERFACE) { // interface descriptor
 						position = descriptors + 18 + 9;
 						remain = descriptors[18 + 9];
 					}
-					else if ((p->wValue >> 8) == ENDPOINT) { // endpoint descriptor
+					else if (descriptortype == ENDPOINT) { // endpoint descriptor
 						position = descriptors + 18 + 9 + 9;
 						remain = descriptors[18 + 9 + 9];
 					}
+					else
+						remain = 0;
 					if (remain > p->wLength)
 						remain = p->wLength;
 					break;
+				case SET_CONFIGURATION:
+					if (p->wValue == 0)
+						state = AddressState;
+					else {
+						configurationvalue = p->wValue;
+						state = ConfiguredState;
+					}
+					break;
 				case SET_DESCRIPTOR:
 				case GET_CONFIGURATION:
-				case SET_CONFIGURATION:
 				case GET_INTERFACE:
 				case SET_INTERFACE:
 				case SYNCH_FRAME:
@@ -944,18 +959,21 @@ int ohci_function_device::execute_transfer(int address, int endpoint, int pid, U
 					break;
 				}
 			}
+			else
+				return handle_nonstandard_request(p);
 			size = 0;
 		}
 		else if (pid == InPid) {
 			// if no data has been transferred (except for the setup stage)
 			// and the lenght of this IN transaction is 0
 			// assume this is the status stage
-			if (size == 0) {
+			if ((size == 0) && (remain == 0)) {
 				if (settingaddress == true)
 				{
 					// set of address is active at end of status stage
 					address = newaddress;
 					settingaddress = false;
+					state = AddressState;
 				}
 				return 0;
 			}
@@ -987,9 +1005,27 @@ int ohci_function_device::execute_transfer(int address, int endpoint, int pid, U
 			}
 		}
 	}
+	else
+		return -1;
 	return size;
 }
 
+int ohci_function_device::handle_nonstandard_request(USBSetupPacket *setup)
+{
+	if ((controltype == VendorType) && (controlrecipient == InterfaceRecipient))
+	{
+		if (setup->bRequest == GET_DESCRIPTOR)
+		{
+			if (setup->wValue == 0x4200)
+			{
+				position = nullptr;
+				remain = 0;
+			}
+		}
+	}
+	return 0;
+}
+
 void xbox_base_state::usb_ohci_interrupts()
 {
 	if (((ohcist.hc_regs[HcInterruptStatus] & ohcist.hc_regs[HcInterruptEnable]) != 0) && ((ohcist.hc_regs[HcInterruptEnable] & MasterInterruptEnable) != 0))
diff --git a/src/mame/video/chihiro.cpp b/src/mame/video/chihiro.cpp
index d1fab8ff46d..f5d413e814e 100644
--- a/src/mame/video/chihiro.cpp
+++ b/src/mame/video/chihiro.cpp
@@ -2593,12 +2593,12 @@ int nv2a_renderer::geforce_exec_method(address_space & space, UINT32 chanel, UIN
 	printf("A:%08X MTHD:%08X D:%08X\n\r",address,maddress,data);
 #endif
 	if (maddress == 0x17fc) {
-#if 1 // useful while debugging to see what coordinates have been used
+#if 0 // useful while debugging to see what coordinates have been used
 		static int debugvc = 0;
 		if (debugvc)
 			if (data == 0)
 			{
-				//printf("%d %d\n\r", primitive_type, vertex_first);
+				printf("%d %d\n\r", (int)primitive_type, vertex_first);
 				for (int n = 0; n < vertex_first; n++)
 					printf("%d X:%f Y:%f Z:%f W:%f x:%f y:%f\n\r", n, vertex_software[n].attribute[0].fv[0], vertex_software[n].attribute[0].fv[1], vertex_software[n].attribute[0].fv[2], vertex_software[n].attribute[0].fv[3], vertex_xy[n].x, vertex_xy[n].y);
 			}