INT 2F - ANSIPLUS.SYS - INSTALLATION CHECK
        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

.