INT 2F - SMARTDRV v4.00+ - SIGNAL SERIOUS ERROR
        AX = 4A10h
        BX = 1234h
Desc:   pops up a message box saying that a serious error occurred and to hit
          R to retry.
Note:   this function is also supported by PC-Cache v8.0.
SeeAlso: AX=4A10h/BX=0000h

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