diff --git a/Descriptors.h b/Descriptors.h
index ad6f1e7..da7553d 100644
--- a/Descriptors.h
+++ b/Descriptors.h
@@ -55,7 +55,7 @@
 		#define CDC_NOTIFICATION_EPSIZE        8
 
 		/** Size in bytes of the CDC data IN and OUT endpoints. */
-		#define CDC_TXRX_EPSIZE                16
+		#define CDC_TXRX_EPSIZE                64
 
 	/* Type Defines: */
 		/** Type define for the device configuration descriptor structure. This must be defined in the
diff --git a/external_mem.c b/external_mem.c
index ccea4d7..3ed844c 100644
--- a/external_mem.c
+++ b/external_mem.c
@@ -20,21 +20,20 @@ void ExternalMem_Init(void)
 	// Initialize the ports connected to address/data/control lines
 	Ports_Init();
 
-	// Disable all pull-ups, on both the address and data lines. They aren't needed
-	// for normal operation.
-	Ports_AddressPullups_RMW(0, (1UL << (HIGHEST_ADDRESS_LINE + 1)) - 1);
-	Ports_DataPullups_RMW(0, 0xFFFFFFFFUL);
-
 	// Configure all address lines as outputs
 	Ports_SetAddressDDR((1UL << (HIGHEST_ADDRESS_LINE - 1)) - 1);
 
-	// Sensible defaults for address and data lines:
+	// Set all data lines as inputs
+	Ports_SetDataDDR(0);
+
+	// Disable all pull-ups on the data lines. They aren't needed
+	// for normal operation.
+	Ports_DataPullups_RMW(0, 0xFFFFFFFFUL);
+
+	// Sensible defaults for address lines:
 	// Write out address zero
 	Ports_SetAddressOut(0);
 
-	// Set all data lines as inputs (with no pullups! we turned them off)
-	Ports_SetDataDDR(0);
-
 	// Control lines
 	Ports_SetCSDDR(1);
 	Ports_SetOEDDR(1);
diff --git a/main.c b/main.c
index ffc1a78..d2424cb 100644
--- a/main.c
+++ b/main.c
@@ -8,6 +8,7 @@
 #include <avr/io.h>
 #include <avr/interrupt.h>
 #include <util/delay.h>
+#include "external_mem.h"
 #include "tests/simm_electrical_test.h"
 #include "usb_serial/usb_serial.h"
 
@@ -18,6 +19,10 @@ int main(void)
 	DDRD |= (1 << 7);
 	PORTD &= ~(1 << 7);
 
+	ExternalMem_Init();
+	ExternalMem_SetAddress(0);
+	ExternalMem_AssertCS();
+	ExternalMem_AssertOE();
 	USBSerial_Init();
 	sei();
 
diff --git a/usb_serial/usb_serial.c b/usb_serial/usb_serial.c
index 7d56715..299d9cc 100644
--- a/usb_serial/usb_serial.c
+++ b/usb_serial/usb_serial.c
@@ -8,6 +8,7 @@
 #include "usb_serial.h"
 #include "../LUFA/Drivers/USB/USB.h"
 #include "../Descriptors.h"
+#include "../external_mem.h"
 
 USB_ClassInfo_CDC_Device_t VirtualSerial_CDC_Interface =
 {
@@ -39,7 +40,24 @@ void USBSerial_Check(void)
 {
 	if (USB_DeviceState == DEVICE_STATE_Configured)
 	{
-		int16_t rb = CDC_Device_ReceiveByte(&VirtualSerial_CDC_Interface);
+		if (CDC_Device_BytesReceived(&VirtualSerial_CDC_Interface))
+		{
+			CDC_Device_ReceiveByte(&VirtualSerial_CDC_Interface);
+
+			uint32_t mem = ExternalMem_ReadData();
+
+			char dataString[11];
+
+			sprintf(dataString, "%02X%02X%02X%02X\r\n",
+					(mem>>24) & 0xFF,
+					(mem>>16) & 0xFF,
+					(mem>>8) & 0xFF,
+					(mem>>0) & 0xFF);
+
+			CDC_Device_SendString(&VirtualSerial_CDC_Interface, dataString);
+		}
+
+		/*int16_t rb = CDC_Device_ReceiveByte(&VirtualSerial_CDC_Interface);
 		if (rb >= 0)
 		{
 			if (rb == '.')
@@ -53,14 +71,50 @@ void USBSerial_Check(void)
 		}
 
 		if (gotChar)
-		{
+		{*/
 			//if (CDC_Device_SendByte(&VirtualSerial_CDC_Interface, 'A') != ENDPOINT_READYWAIT_NoError)
-			if (CDC_Device_SendData(&VirtualSerial_CDC_Interface,
-					"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA", 64) != ENDPOINT_RWSTREAM_NoError)
+			/*if (CDC_Device_SendData(&VirtualSerial_CDC_Interface,
+					"ASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDF"
+					"ASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDF"
+					"ASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDF"
+					"ASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDF"
+					"ASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDF"
+					"ASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDF"
+					"ASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDF"
+					"ASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDF"
+					"ASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDF"
+					"ASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDF"
+					"ASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDF"
+					"ASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDF"
+					"ASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDF"
+					"ASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDF"
+					"ASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDF"
+					"ASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDF"
+					"ASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDF"
+					"ASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDF"
+					"ASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDF"
+					"ASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDF"
+					"ASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDF"
+					"ASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDF"
+					"ASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDF"
+					"ASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDF"
+					"ASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDF"
+					"ASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDF"
+					"ASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDF"
+					"ASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDF"
+					"ASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDF"
+					"ASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDF"
+					"ASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDF"
+					"ASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDFASDF"
+					, 2048) != ENDPOINT_RWSTREAM_NoError)
 			{
 				PORTD |= (1 << 7);
 			}
-		}
+			else
+			{
+				PORTD &= ~(1 << 7);
+			}*/
+		//}
 	}
 
 	CDC_Device_USBTask(&VirtualSerial_CDC_Interface);