Int 2F Fn 1A00  - Ansiplus.sys - Installation Check                        [V]

   AX = 1A00h
   BX = 414Eh ('AN')
   CX = 5349h ('SI')
   DX = 2B2Bh ('++')

Return: AL = FFh if installed
       CF clear
       ES:BX -> INT 29 entry point
Program: ANSIPLUS.SYS is a CON device driver by Kristofer Sweger which
     replaces the normal ANSI.SYS is a more powerful version with many
     additional features

Note:  ANSIPLUS also identifies itself as ANSI.SYS if BX,CX, or DX differ
     from the magic values above