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OCR: 80x66 Processor TR TSS Segment Selector System Memory TSS GOT 0x8 TSS Segment Descriptor 0x64 1OPM Offset JOPM Figure 1: The segment selector in the processor's TR points to the segment descriptor in the GDT, which defines the location and size of the TSS in memory. The IOPM is stored as part of the TSS. Its offset is stored in a 2-byte integer at location 0x66 in the TSS.