diff --git a/src/keyboard.js b/src/keyboard.js
index 1db3267..b54a001 100644
--- a/src/keyboard.js
+++ b/src/keyboard.js
@@ -100,6 +100,63 @@ function key_identifier_sane(keyCode, keyIdentifier) {
 
 }
 
+var keycodeKeysyms = {
+	8:   [0xFF08], // backspace
+	9:   [0xFF09], // tab
+	12:  [0xFF0B, 0xFF0B, 0xFF0B, 0xFFB5], // clear       / KP 5
+	13:  [0xFF0D], // enter
+	16:  [0xFFE1, 0xFFE1, 0xFFE2], // shift
+	17:  [0xFFE3, 0xFFE3, 0xFFE4], // ctrl
+	18:  [0xFFE9, 0xFFE9, 0xFE03], // alt
+	19:  [0xFF13], // pause/break
+	20:  [0xFFE5], // caps lock
+	27:  [0xFF1B], // escape
+	32:  [0x0020], // space
+	33:  [0xFF55, 0xFF55, 0xFF55, 0xFFB9], // page up     / KP 9
+	34:  [0xFF56, 0xFF56, 0xFF56, 0xFFB3], // page down   / KP 3
+	35:  [0xFF57, 0xFF57, 0xFF57, 0xFFB1], // end         / KP 1
+	36:  [0xFF50, 0xFF50, 0xFF50, 0xFFB7], // home        / KP 7
+	37:  [0xFF51, 0xFF51, 0xFF51, 0xFFB4], // left arrow  / KP 4
+	38:  [0xFF52, 0xFF52, 0xFF52, 0xFFB8], // up arrow    / KP 8
+	39:  [0xFF53, 0xFF53, 0xFF53, 0xFFB6], // right arrow / KP 6
+	40:  [0xFF54, 0xFF54, 0xFF54, 0xFFB2], // down arrow  / KP 2
+	45:  [0xFF63, 0xFF63, 0xFF63, 0xFFB0], // insert      / KP 0
+	46:  [0xFFFF, 0xFFFF, 0xFFFF, 0xFFAE], // delete      / KP decimal
+	91:  [0xFFEB], // left window key (hyper_l)
+	92:  [0xFF67], // right window key (menu key?)
+	93:  null,     // select key
+	96:  [0xFFB0], // KP 0
+	97:  [0xFFB1], // KP 1
+	98:  [0xFFB2], // KP 2
+	99:  [0xFFB3], // KP 3
+	100: [0xFFB4], // KP 4
+	101: [0xFFB5], // KP 5
+	102: [0xFFB6], // KP 6
+	103: [0xFFB7], // KP 7
+	104: [0xFFB8], // KP 8
+	105: [0xFFB9], // KP 9
+	106: [0xFFAA], // KP multiply
+	107: [0xFFAB], // KP add
+	109: [0xFFAD], // KP subtract
+	110: [0xFFAE], // KP decimal
+	111: [0xFFAF], // KP divide
+	112: [0xFFBE], // f1
+	113: [0xFFBF], // f2
+	114: [0xFFC0], // f3
+	115: [0xFFC1], // f4
+	116: [0xFFC2], // f5
+	117: [0xFFC3], // f6
+	118: [0xFFC4], // f7
+	119: [0xFFC5], // f8
+	120: [0xFFC6], // f9
+	121: [0xFFC7], // f10
+	122: [0xFFC8], // f11
+	123: [0xFFC9], // f12
+	144: [0xFF7F], // num lock
+	145: [0xFF14], // scroll lock
+	225: [0xFE03]  // altgraph (iso_level3_shift)
+};
+
 var keyidentifier_keysym = {
     "Again": [0xFF66],
     "AllCandidates": [0xFF3D],