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Int 2F Fn 120F U - DOS 3+ Internal - Make Buffer Most Recently Used [D]
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: AX=1207h
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