XP SP2 Pro - Turion 64 mobile - hp pavilion dv5000 1gb ram

Playing with keyboard.. Inside the game if I hit the 'up' arrow and after hit the 'left' arrow but still pressing the 'up' arrow the car will not accelerate more even if I release the 'left' arrow. I takes to release and hit 'up' again to have it accelerate.

As far as I can remember it was not necessary on original DOS. As far as you pressed 'up' arrow it would continue to accelerate. I also tested with copy con, pressing a second key stops sending messages for the first key even if it's still pressed. I checked map layout and these keys haven't the 'hold' option turned on.

Is this the standard behavior, a bug or a misconfiguration?

Any help will be greatly appreciated. Thanks! DOSBOX initiative rocks!