Unit Instance

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        "Next, the real-mode IVT (Interrupt Vector Table is updated.  The IVT is an array of segment/offset pairs for exception and interrupt handlers.  The BIOS normally maps hardware interrupts to interrupt vectors `0x8` to `0xf` and `0x70` to `0x77` but, as will be seen, the 8259A Programmable Interrupt Controller, the chip controlling the actual mapping of hardware interrupts to interrupt vectors, is programmed to remap these interrupt vectors from `0x8-0xf` to `0x20-0x27` and from `0x70-0x77` to `0x28-0x2f`.  Thus, interrupt handlers are provided for interrupt vectors `0x20-0x2f`.  The reason the BIOS-provided handlers are not used directly is because they work in 16-bit real mode, but not 32-bit protected mode.  Processor mode will be switched to 32-bit protected mode shortly.  However, the BTX server sets up a mechanism to effectively use the handlers provided by the BIOS:"
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    "location": "documentation/content/en/books/arch-handbook/boot/_index.adoc:970",
    "context": "",
    "note": "type: Plain text",
    "flags": "",
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    "position": 177,
    "has_suggestion": false,
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    "has_failing_check": false,
    "num_words": 134,
    "source_unit": "https://translate-dev.freebsd.org/api/units/1436605/?format=api",
    "priority": 100,
    "id": 1437285,
    "web_url": "https://translate-dev.freebsd.org/translate/documentation/booksarch-handbookboot_index/fr_FR/?checksum=572eff24cfa9e888",
    "url": "https://translate-dev.freebsd.org/api/units/1437285/?format=api",
    "explanation": "",
    "extra_flags": "",
    "pending": false,
    "timestamp": "2022-07-08T02:59:36.665067Z"
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