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OCR: Interrupt Descriptor Interrupt Vectors List Located in Data Located in Low Segment Memory Common Interrupt Call Service Routine CISE (CISR) Located in User Fn1 Code Segment Timer Call Fn[x] Com2 Call CISE User Fn 2 Gotten here from an intersegment call? "return address consists of segment. DS) and offset (points to user function in CS) Figure 2: Interrupt processing using a common ISR.