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INT 2F U - DOS 3+ internal - MAKE BUFFER MOST RECENTLY USED
        AX = 120Fh
        DS:DI -> disk buffer
        SS = DOS DS (must be using a DOS internal stack)
Return: DS:DI -> next buffer in buffer list
Desc:   move the indicated buffer to the end of the disk buffer chain (least-
          recently used is first); under DOS 3.3, the buffer is then moved to
          the start of the disk buffer chain if it was marked unused
Note:   this function is the same as AX=1207h except that it returns a
          pointer to the buffer following the specified buffer in the buffer
          chain

See Also: 2F1207
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