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Category: DOS extenders
Flags: available only in protected mode

INT 21 - Phar Lap 386/DOS-Extender v3.0+ - INSTALL MOD. SEG FAILURE HANDLER

	AX = 253Ah
	ES:EBX -> function to be called when INT 21/AH=4Ah is about to return
		an error
Return: CF clear
	ES:EBX -> previous handler
SeeAlso: AH=4Ah

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