Int 61 Fn 0B  - Atari Portfolio - Determine Ccm Validity                   [b]

   AH = 0Bh
   AL = drive number (00h = A:,01h = B:)

Return: CF clear if successful (card present and correct)
   CF set on error
       AH = error code (see #0166 at INT 13/AH=01h)

See Also: AH=00h"Portfolio",AH=07h"Portfolio",AH=0Dh"Portfolio"