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AH = 21h
Return:
AX = status (0000h successful)
Desc: Immediately write all dirty sectors back to disk
Note: This is one out of several cache flush calls issued by the PTS-DOS 6.51 and S/DOS 1.0 kernel before rebooting. It is called with DL=80h and conflicts with the PS/2 function of the same function number, because the kernel does not perform Quickcache's installation check first.
See Also: AH=25h"QUICKCACHE" - AH=2Eh - AH=2Fh
Category: Caches/Spoolers - Int 13h - Q
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