INT 7C - SK-UPPS Data Link Interface API(Application Program[ming] Interface) The defined set of calls which a program may make to interact with or request services of the operating system or environment under which it is running.  Because the inputs and outputs of the calls are well-defined, a program using the API can continue using the identical calls even if the internal organization of the program providing the API changes. - DLI 2.8+ - INTERRUPT REQUEST
	AX = 0017h
Return: AX = completion code (see #03846)
Notes:	not supported by all DLIs (will return AX=FFFFh, if not supported).
	must be called with interrupts disabled; when the client re-enables
	  interrupts, an interrupt will be generated and reported to the client
	  through an Event Upcall (see [EV_ISR_START/EV_ISR_END]">#03853 [EV_ISR_START/EV_ISR_END])
SeeAlso: AX=0007h