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2F1A43BX4156

Category: serial I/O

INT 2F - AVATAR Serial Dispatcher - INSTALL IRQ4 HANDLER

	AX = 1A43h
	BX = 4156h ('AV')
	ES:DI -> FAR handler for serial port using IRQ4
	DS = data segment needed by handler
Return: AX = status/return value
	    0000h if no more room
	    1A43h if ASD not installed
	    else handle to use when uninstalling
Notes:	(see AX=1A42h)
SeeAlso: AX=1A42h,AX=1A63h

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