Int 2F Fn 1AA9  - Ansiplus V3.10+ - Get Ansiplus Scrollback Information    [V]

   AX = 1AA9h

Return: AL = status
       00h successful
       BX = current number of lines in scrollback buffer
       CX = number of bytes in one line
       01h unsupported video mode active
       02h screen currently scrolled back
       03h reduced capability driver
       A9h unsupported function (driver before v3.10)
Desc:  determine how much data is in the scrollback buffer and initialize
     scrollback retrieval to return the first line on the next call to
     AX=1AA8h

See Also: AX=1A00h/BX=414Eh,AX=1AA8h