Int 60 Fn AD  - Accessdos - Api                                            [a]

   AH = ADh
   AL = function
       E1h ???

       Return: AX = ???
       E2h get configuration

       Return: BX:AX -> configuration data
Program: AccessDOS is a public domain TSR developed at The Trace Research and
     Development Center which provides extensions for keyboard, mouse,
     and sound access by the visually, hearing, or motor-control
     impaired.
Range: INT 60 to INT 66, selected by scanning for 0000h:0000h vector

Note:  the installation check is to test for the signature "ACCESSv1.00"
     beginning three bytes past the start of the interrupt handler (this
     same signature is also present in v1.10)