diff -ur usbasp.2011-05-28/firmware/main.c usbasp.2011-05-28-mx-usbisp-v300/firmware/main.c
--- usbasp.2011-05-28/firmware/main.c	2011-05-28 02:57:49.000000000 -0500
+++ usbasp.2011-05-28-mx-usbisp-v300/firmware/main.c	2013-11-07 15:40:33.626413704 -0600
@@ -306,11 +306,12 @@
 	/* no pullups on USB and ISP pins */
 	PORTD = 0;
 	PORTB = 0;
-	/* all outputs except PD2 = INT0 */
-	DDRD = ~(1 << 2);
+	/* all outputs except PD2 = INT0 and alternate LED outputs */
+	DDRD = ~(1<<2 | 1<<5 | 1<<6);
 
 	/* output SE0 for USB reset */
 	DDRB = ~0;
+	PORTD = 1<<3; // USB D+ isn't on B0 anymore
 	j = 0;
 	/* USB Reset by device only required on Watchdog Reset */
 	while (--j) {
@@ -321,6 +322,8 @@
 	}
 	/* all USB and ISP pins inputs */
 	DDRB = 0;
+	/* all outputs except PD2 = INT0, PD3 = D+, and alternate LED outputs */
+	DDRD = ~(1<<3 | 1<<2 | 1<<5 | 1<<6);
 
 	/* all inputs except PC0, PC1 */
 	DDRC = 0x03;
diff -ur usbasp.2011-05-28/firmware/usbconfig.h usbasp.2011-05-28-mx-usbisp-v300/firmware/usbconfig.h
--- usbasp.2011-05-28/firmware/usbconfig.h	2011-05-28 03:28:52.000000000 -0500
+++ usbasp.2011-05-28-mx-usbisp-v300/firmware/usbconfig.h	2013-11-07 15:41:02.326414167 -0600
@@ -22,15 +22,15 @@
 
 /* ---------------------------- Hardware Config ---------------------------- */
 
-#define USB_CFG_IOPORTNAME      B
+#define USB_CFG_IOPORTNAME      D
 /* This is the port where the USB bus is connected. When you configure it to
  * "B", the registers PORTB, PINB and DDRB will be used.
  */
-#define USB_CFG_DMINUS_BIT      0
+#define USB_CFG_DMINUS_BIT      3
 /* This is the bit number in USB_CFG_IOPORT where the USB D- line is connected.
  * This may be any bit in the port.
  */
-#define USB_CFG_DPLUS_BIT       1
+#define USB_CFG_DPLUS_BIT       2
 /* This is the bit number in USB_CFG_IOPORT where the USB D+ line is connected.
  * This may be any bit in the port. Please note that D+ must also be connected
  * to interrupt pin INT0!