diff --git a/Packages/vChewing_CocoaExtension/Sources/CocoaExtension/CocoaExtension_NSEvent.swift b/Packages/vChewing_CocoaExtension/Sources/CocoaExtension/CocoaExtension_NSEvent.swift
index c518e0e0..a6d01fe7 100644
--- a/Packages/vChewing_CocoaExtension/Sources/CocoaExtension/CocoaExtension_NSEvent.swift
+++ b/Packages/vChewing_CocoaExtension/Sources/CocoaExtension/CocoaExtension_NSEvent.swift
@@ -303,3 +303,29 @@ public enum EmacsKey {
   static let charKeyMapHorizontal: [UInt16: UInt16] = [6: 124, 2: 123, 1: 115, 5: 119, 4: 117, 22: 121]
   static let charKeyMapVertical: [UInt16: UInt16] = [6: 125, 2: 126, 1: 115, 5: 119, 4: 117, 22: 121]
 }
+
+// MARK: - Apple ABC Keyboard Mapping
+
+let arrAppleABCKeyboardMap: [UInt16: (String, String)] = [
+  50: ("`", "~"), 18: ("1", "!"), 19: ("2", "@"), 20: ("3", "#"), 21: ("4", "$"), 23: ("5", "%"), 22: ("6", "^"),
+  26: ("7", "&"), 28: ("8", "*"), 25: ("9", "("), 29: ("0", ")"), 27: ("-", "_"), 24: ("=", "+"), 12: ("q", "Q"),
+  13: ("w", "W"), 14: ("e", "E"), 15: ("r", "R"), 17: ("t", "T"), 16: ("y", "Y"), 32: ("u", "U"), 34: ("i", "I"),
+  31: ("o", "O"), 35: ("p", "P"), 33: ("[", "{"), 30: ("]", "}"), 42: ("\\", "|"), 0: ("a", "A"), 1: ("s", "S"),
+  2: ("d", "D"), 3: ("f", "F"), 5: ("g", "G"), 4: ("h", "H"), 38: ("j", "J"), 40: ("k", "K"), 37: ("l", "L"),
+  41: (";", ":"), 39: ("'", "\""), 6: ("z", "Z"), 7: ("x", "X"), 8: ("c", "C"), 9: ("v", "V"), 11: ("b", "B"),
+  45: ("n", "N"), 46: ("m", "M"), 43: (",", "<"), 47: (".", ">"), 44: ("/", "?"),
+]
+
+extension NSEvent {
+  public var inAppleABCStaticForm: NSEvent {
+    if type == .flagsChanged { return self }
+    guard modifierFlags == .shift || modifierFlags == [] else { return self }
+    if !arrAppleABCKeyboardMap.keys.contains(keyCode) { return self }
+    guard let dataTuplet = arrAppleABCKeyboardMap[keyCode] else { return self }
+    let result: NSEvent? = reinitiate(
+      characters: isShiftHold ? dataTuplet.1 : dataTuplet.0,
+      charactersIgnoringModifiers: dataTuplet.0
+    )
+    return result ?? self
+  }
+}