diff -u PS2_8042/ps2keybd.cpp PS2_XT_PATCH/ps2keybd.cpp
--- PS2_8042/ps2keybd.cpp	2004-07-01 13:00:00.000000000 -0700
+++ PS2_XT_PATCH/ps2keybd.cpp	2006-05-12 18:46:18.770932800 -0700
@@ -34,7 +34,102 @@
 static const UINT8 scE0Extended	= 0xe0;
 static const UINT8 scE1Extended	= 0xe1;
 
+#ifndef MODE_XT
 static const UINT8 scKeyUp = 0xf0;
+#else // !MODE_XT
+static const UINT8 scXtDepressMask = 0x80;
+
+static const UINT8 XtToAt[] = 
+{
+    /* 00 */ 0x00,
+    /* 01 */ 0x76,
+    /* 02 */ 0x16,
+    /* 03 */ 0x1E,
+    /* 04 */ 0x26,
+    /* 05 */ 0x25,
+    /* 06 */ 0x2E,
+    /* 07 */ 0x36,
+    /* 08 */ 0x3D,
+    /* 09 */ 0x3E,
+    /* 0A */ 0x46,
+    /* 0B */ 0x45,
+    /* 0C */ 0x4E,
+    /* 0D */ 0x55,
+    /* 0E */ 0x66,
+    /* 0F */ 0x0D,
+    /* 10 */ 0x15,
+    /* 11 */ 0x1D,
+    /* 12 */ 0x24,
+    /* 13 */ 0x2D,
+    /* 14 */ 0x2C,
+    /* 15 */ 0x35,
+    /* 16 */ 0x3C,
+    /* 17 */ 0x43,
+    /* 18 */ 0x44,
+    /* 19 */ 0x4D,
+    /* 1A */ 0x54,
+    /* 1B */ 0x5B,
+    /* 1C */ 0x5A,
+    /* 1D */ 0x14,
+    /* 1E */ 0x1C,
+    /* 1F */ 0x1B,
+    /* 20 */ 0x23,
+    /* 21 */ 0x2B,
+    /* 22 */ 0x34,
+    /* 23 */ 0x33,
+    /* 24 */ 0x3B,
+    /* 25 */ 0x42,
+    /* 26 */ 0x4B,
+    /* 27 */ 0x4C,
+    /* 28 */ 0x52,
+    /* 29 */ 0x0E,
+    /* 2A */ 0x12,
+    /* 2B */ 0x5D,
+    /* 2C */ 0x1A,
+    /* 2D */ 0x22,
+    /* 2E */ 0x21,
+    /* 2F */ 0x2A,
+    /* 30 */ 0x32,
+    /* 31 */ 0x31,
+    /* 32 */ 0x3A,
+    /* 33 */ 0x41,
+    /* 34 */ 0x49,
+    /* 35 */ 0x4A,
+    /* 36 */ 0x59,
+    /* 37 */ 0x7C,
+    /* 38 */ 0x11,
+    /* 39 */ 0x29,
+    /* 3A */ 0x58,
+    /* 3B */ 0x05,
+    /* 3C */ 0x06,
+    /* 3D */ 0x04,
+    /* 3E */ 0x0C,
+    /* 3F */ 0x03,
+    /* 40 */ 0x0B,
+    /* 41 */ 0x83,
+    /* 42 */ 0x0A,
+    /* 43 */ 0x01,
+    /* 44 */ 0x09,
+    /* 45 */ 0x77,
+    /* 46 */ 0x7E,
+    /* 47 */ 0x6C,
+    /* 48 */ 0x75,
+    /* 49 */ 0x7D,
+    /* 4A */ 0x7B,
+    /* 4B */ 0x6B,
+    /* 4C */ 0x73,
+    /* 4D */ 0x74,
+    /* 4E */ 0x79,
+    /* 4F */ 0x69,
+    /* 50 */ 0x72,
+    /* 51 */ 0x7A,
+    /* 52 */ 0x70,
+    /* 53 */ 0x71,
+    /* 56 */ 0x61,
+    /* 57 */ 0x78,
+    /* 58 */ 0x07
+};
+#endif // MODE_XT
 
 
 //	There is really only one physical keyboard supported by the system.
@@ -85,8 +180,8 @@
 
     static	UINT32	scInProgress;
     static	UINT32	scPrevious;
-	static	BOOL	fKeyUp;
-	
+    static	BOOL	fKeyUp;
+    
     UINT8   ui8ScanCode;
     BOOL    fEvent = FALSE;
     UINT    cEvents = 0;
@@ -100,11 +195,28 @@
         (_T("%s: scan code 0x%08x, code in progress 0x%08x, previous 0x%08x\r\n"),
         pszFname, ui8ScanCode, scInProgress, scPrevious));
 
-	if ( ui8ScanCode == scKeyUp )
+#ifdef MODE_XT
+    fKeyUp = FALSE;
+    if ( ( ui8ScanCode & ~scXtDepressMask ) < dim ( XtToAt ) ) 
+        {
+        fKeyUp = ( ui8ScanCode & scXtDepressMask ) ? TRUE : FALSE;
+        ui8ScanCode = XtToAt [ ui8ScanCode & ~scXtDepressMask ];
+        }
+    else if ( ( ui8ScanCode != scE0Extended ) && ( ui8ScanCode != scE1Extended ) )
+		{
+		ui8ScanCode = 0;
+		}
+    if ( ui8ScanCode == 0 )
+		{
+		// Unknown scancode - do nothing
+		}
+#else // MODE_XT
+    if ( ui8ScanCode == scKeyUp )
 		{
 		fKeyUp = TRUE;
 		}
-	else if ( ui8ScanCode == scE0Extended )
+#endif // !MODE_XT
+    else if ( ui8ScanCode == scE0Extended )
 		{
 		scInProgress = 0xe000;
 		}
diff -u PS2_8042/ps2port.cpp PS2_XT_PATCH/ps2port.cpp
--- PS2_8042/ps2port.cpp	2004-07-01 13:00:00.000000000 -0700
+++ PS2_XT_PATCH/ps2port.cpp	2006-05-12 18:46:18.871076800 -0700
@@ -68,6 +68,9 @@
 
 // Keyboard modes
 static const UINT8 cmdKeybdModeAT   = 0x02;
+#ifdef MODE_XT
+static const UINT8 cmdKeybdModeXT   = 0x01;
+#endif // MODE_XT
 
 //
 // Commands sent to the mouse.
@@ -630,11 +633,10 @@
 			break;
 			}
 
-		if( !OutputBufPollRead(&ui8Data) )
+        if( !OutputBufPollRead(&ui8Data) )
 			{
 			break;
 			}
-
 		if( ui8Data == response8042Ack )
 			{
 			bRet = true;
@@ -758,7 +760,11 @@
 
     if ( KeyboardCommandPut(cmdKeybdSetMode) ) 
         {
+#ifdef MODE_XT
+        KeyboardCommandPut(cmdKeybdModeXT);
+#else
         KeyboardCommandPut(cmdKeybdModeAT);
+#endif
         }
 
     bRet = true;