INT 2F U - DOS 3.3+ internal - READ FROM FILE
AX = 1229h
BX = file handle
CX = number of bytes to read
DS:DX -> buffer
SS = DOS DS (must be using a DOS internal stack)
Return: as for INT 21/AH=3Fh
Note:   equivalent to INT 21/AH=3Fh, but may only be called when already inside
a DOS function call
SeeAlso: INT 21/AH=3Fh

See also: 2F1226

2F1229 - DOS 3.3+ internal - READ FROM FILE