INT 2F - ANSIPLUS v4.02+ - GET/SET ANSIPLUS SMOOTH SCROLLING RATE
AX = 1AA4h
BL = function
00h get scrolling rate
01h set scrolling rate
BH = new minimum scrolling rate in scan lines per retrace
Return: BH = smooth scrolling rate
SeeAlso: AX=1AA3h,AX=1AA5h