Int 21 Fn DF05 - Software Carousel - Change Partition Size [T]
AX = DF05h
BL = task number
DX = new size in KB
Return: AL = status
00h Carousel not running
01h successful
FFh unsucessful
AH = error code (01h,04h,05h) (see #1501)
BX = minimum size allowed
CX = maximum size available
See Also: AX=DF03h