diff --git a/abstract-machine/am/src/platform/nemu/ioe/input.c b/abstract-machine/am/src/platform/nemu/ioe/input.c
index fb7cee8..f412cdf 100644
--- a/abstract-machine/am/src/platform/nemu/ioe/input.c
+++ b/abstract-machine/am/src/platform/nemu/ioe/input.c
@@ -5,5 +5,5 @@
 
 void __am_input_keybrd(AM_INPUT_KEYBRD_T *kbd) {
   kbd->keycode = inl(KBD_ADDR); // AM_KEY_NONE;
-  kbd->keydown = (kbd->keycode != AM_KEY_NONE) ? false : true;
+  kbd->keydown = kbd->keycode & KEYDOWN_MASK;
 }