X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 21 - dos

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INT 21 - DOS - SET VERIFY FLAG
        AH = 2Eh
        DL = 00h
        AL = 01h VERIFY on
             00h VERIFY off
Note:   when ON, all disk writes are verified
SeeAlso: AH=54h

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