X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 13 - swbios

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INT 13 - SWBIOS - INSTALLATION CHECK
        AH = F9h
        DL = drive number (80h,81h)
Return: CF clear
            DX = configuration word
                bit 15 set if other SWBIOS extensions available
        CF set on error
Note:   SWBIOS is a TSR by Ontrack Computer Systems; Disk Manager also supports
          these calls
SeeAlso: AH=EEh

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