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[Archon III]

I have a simple loop for a small simulation I'm making. The problem is with IsKeyDown. The code works as expected in the emulator on my computer, but when I put it on my calculator (fx-9860GII) the function just stops execution and nothing happens even when I press the exit key.

while(!IsKeyDown(KEY_CTRL_EXIT)) {
  update();
  draw();
  Sleep(timeStep * 1000);
}

Isn't IsKeyDown not supposed to block execution? And is there any other way to check for key input without blocking execution? Thx.