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Int 2F Fn 120E U - DOS 3+ Internal - Mark All Disk Buffers Unreferenced [D]
AX = 120Eh
SS = DOS DS (must be using a DOS internal stack)
Return: DS:DI -> first disk buffer
Notes: clears "referenced" flag on all disk buffers
in DOS 5+, this has become essentially a NOP, invoking the same code
used by AX=1224h (SHARING DELAY)
See Also: AX=1209h,AX=1210h,INT 21/AH=0Dh
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