diff --git a/src/common/input/Keyboard.test.ts b/src/common/input/Keyboard.test.ts
index 9bde7594..8c7f0dbc 100644
--- a/src/common/input/Keyboard.test.ts
+++ b/src/common/input/Keyboard.test.ts
@@ -350,7 +350,15 @@ describe('Keyboard', () => {
     });
 
     it('should return proper sequence for ctrl+@', () => {
-      assert.equal(testEvaluateKeyboardEvent({ ctrlKey: true, shiftKey: true, keyCode: 50, key: '@' }).key, '\x00');
+      assert.equal(testEvaluateKeyboardEvent({ ctrlKey: true, shiftKey: true, keyCode: 50, code: 'Digit2', key: '@' }).key, '\x00');
+    });
+
+    it('should return proper sequence for ctrl+^', () => {
+      assert.equal(testEvaluateKeyboardEvent({ ctrlKey: true, shiftKey: true, keyCode: 54, code: 'Digit6', key: '^' }).key, '\x1e');
+    });
+
+    it('should return proper sequence for ctrl+_', () => {
+      assert.equal(testEvaluateKeyboardEvent({ ctrlKey: true, shiftKey: true, keyCode: 189, code: 'Minus', key: '_' }).key, '\x1f');
     });
 
   });
diff --git a/src/common/input/Keyboard.ts b/src/common/input/Keyboard.ts
index 31e66740..32085467 100644
--- a/src/common/input/Keyboard.ts
+++ b/src/common/input/Keyboard.ts
@@ -360,12 +360,11 @@ export function evaluateKeyboardEvent(
         // Include only keys that that result in a _single_ character; don't include num lock,
         // volume up, etc.
         result.key = ev.key;
-      } else if (ev.key && ev.ctrlKey) {
-        if (ev.key === '_') { // ^_
-          result.key = C0.US;
-        }
-        if (ev.key === '@') { // ^ + shift + 2 = ^ + @
-          result.key = C0.NUL;
+      } else if (ev.key && ev.ctrlKey && ev.shiftKey) {
+        switch (ev.code) {
+          case 'Minus':  result.key = C0.US;  break; // ^_ (Ctrl+Shift+-_
+          case 'Digit2': result.key = C0.NUL; break; // ^@ (Ctrl+Shift+2)
+          case 'Digit6': result.key = C0.RS;  break; // ^^ (Ctrl+Shift+6)
         }
       }
       break;