Int 7F Fn 24  - Alloy Ntnx, Mw386 - Attach Or Release Drive For Low-level  [N]

   AH = 24h
   CL = function
       00h attach
       01h release
   CH = drive (0=A:,1=B:,etc)

Return: AX = status (see #3634)

Note:  only drives on the current machine may be attached

(Table 3634)
Values for Alloy function status:
 00h   successful
 01h   invalid request
 02h   already attached
 03h   not attached
 04h   lock table full