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

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INT 21 - DOS - BUFFERED KEYBOARD INPUT
        AH = 0Ah
        DS:DX -> buffer
Notes:  first byte of buffer must contain maximum length
        on entry, second byte contains actual length of previous line which may
          be recalled with the DOS line-editing commands
        on return the second byte contains actual length, third and
          subsequent bytes contain the input line

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