INT 24 - DOS 1+ - CRITICAL ERROR HANDLER

Notes:	invoked when a critical (usually hardware) error is encountered by DOS
	  (see #02543); should never be called directly
	when DOS terminates a program, it copies the previous value of the
	  INT 24 vector out of the PSP (see #01378) and into the interrupt
	  vector table
SeeAlso: INT 21/AH=95h,INT 21/AH=59h/BX=0000h,INT 21/AH=92h"PTS-DOS"