DOS / Interrupts / Int 2F / 12/1F


                    DOS INTERNAL SERVICES - Initialize LDT

Input	DOS1	N	DOS2	N	DOS3	Y	DOS5	Y	Output
AX	12h		1Fh		Error Code				AX
BX									BX
CX									CX
DX									DX
Stack	Drive Letter in ASCII				Set if Error				CF