First half of the routine that handles sprites being carried, though it's actually only the part that handles the P-balloon.
Any other sprite will branch to $019FE0
$019FA7 change to EA EA EA EA EA to the P-Balloon last forever.
$019FB0 is the time at which the deflatting animation starts. (default 30)
$019FC2 change 90 to 80 to make Mario keep the balloon effect even after taking hits or power-ups. (causes weird behaviour when dying)