Donkey Kong Junior Attempt 1

I apparently can't figure out how to do "super jumps" off the tramponines/springs in (I believe it's) level 3. I recalled that you had to push the jump button at just the right time in the arcade, so not sure if it's more difficult using a keyboard or if I just don't have the right reflexes anymore. I will keep trying though (especially since I have the same issue with the arcade game Kangaroo in the future).