INT 13 u - QUICKCACHE II v4.20 - SET FLUSH COUNT
        AH = 2Eh
        BX = flush count
Return: AX = status (0000h successful)
Desc:   specify how many dirty sectors the cache should write after each flush
          interval (see AH=25h) when buffered writes are enabled
SeeAlso: AH=21h,AH=25h,AH=2Ch

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