Nothing to do with the computer on the bus. It is all controlled by the pilot and when they move the flap lever position up. I have flown the 320 but not a 37 so its hard to compare. I would say it has something to do with the common flap settings on TO. In the 320 you have Flaps 0, 1,2,3,full. Normally you use Flap 1 or 2 for T.O. In the 737 I believe that you have a few more and Im not sure what their profile is.