| 21. | The 28 / had 1024-bit instruction words.
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| 22. | Finally, in long mode ( AMD Opteron onwards ), 64-bit instructions, and more registers, are also available.
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| 23. | Each 48-bit word contained two 24-bit instructions.
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| 24. | When long mode is operating, 16-bit instructions and virtual x86 mode are disabled and protected mode disappears.
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| 25. | To provide backward compatibility, segments with executable code can be marked as containing either 16-bit or 32-bit instructions.
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| 26. | Since the x86-64 architecture includes hardware-level support for 32-bit instructions, WoW64 simply switches the process between 32-and 64-bit modes.
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| 27. | This required small opcodes in order to leave room for a reasonably sized constant in a 32-bit instruction word.
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| 28. | It operates in parallel with the main processor, both processors receiving their instructions from a single 32-bit instruction stream.
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| 29. | An instruction is composed of a 6-bit instruction ( conventionally represented in octal ) and a 13 bit address.
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| 30. | The processor address bus was now 16 bits and the instruction set consisted of 8, 16, and 24 bit instructions.
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