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X-Hacker.org- Interrupts & Ports - ah = 20h http://www.X-Hacker.org [<<Previous Entry] [^^Up^^] [Next Entry>>] [Menu] [About The Guide] 
        AH = 20h
        AL = subfunction
            00h ???
            01h ???
            10h setup of SYSREQ routine (OS hook)
            11h completion of SYSREQ function (OS hook)
Note: AL = 0,1 set or reset some flags which affect what PRINT does when it
      tries to access the disk
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