INT 2F U - DOS 3+ internal - SET DRIVE???
AX = 1219h
SS = DOS DS (must be using a DOS internal stack)
STACK: WORD drive (0 = default, 1 = A:, etc)
Return: ???
STACK unchanged
Notes:  calls AX=1217h
builds a current directory structure if inside server call
(INT 21/AX=5D00h)
SeeAlso: AX=121Fh

See also: 2F1217

2F1219 - DOS 3+ internal - SET DRIVE???