Int 17 Fn 9A  - Alloy Ntnx,mw386 - Set Tab Expansion                       [N]

   AH = 9Ah
   AL = mode
       00h NTNX compatibility
       DX = NTNX printer number (see AH=88h)
           (FFFFh = current logical LPT1)
       01h MW386
       DX = MW386 printer number
   CL = tab length (00h = no expansion, 01h-63h = spaces per tab)

Return: AL = status (see AH=81h)

Note:  beginning with MW386 v2.0, tab expansion is set on a per-printer basis
     rather than a per-user basis; NTNX and MW386 v1.x ignore DX

See Also: AH=A4h