DOS / Interrupts / Int 2F / 1A/00


                      ANSI.SYS - Get Installation State

Input	DOS1	N	DOS2	N	DOS3	Y	DOS5	Y	Output
AX	1Ah		00h				Install Flag		AX
BX									BX
CX									CX
DX									DX
ES:DI									CF

Install Flag:   00h = Not installed, OK to install
                01h = Not installed, not OK to install
                FFh = Installed