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Rev 302 Rev 305
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    outb(PIC_PIC1PORT1, PIC_ICW1 | PIC_NEEDICW4);
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    outb(PIC_PIC1PORT1, PIC_ICW1 | PIC_NEEDICW4);
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    /* ICW2: IRQ 8 maps to INT (IVT_IRQBASE + 8) */
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    /* ICW2: IRQ 8 maps to INT (IVT_IRQBASE + 8) */
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    outb(PIC_PIC1PORT2, IVT_IRQBASE + 8);
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    outb(PIC_PIC1PORT2, IVT_IRQBASE + 8);
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    /* ICW3: pic1 is known as PIC_PIC1ID */
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    /* ICW3: pic1 is known as IRQ_PIC1 */
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    outb(PIC_PIC1PORT2, IRQ_PIC1);
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    outb(PIC_PIC1PORT2, IRQ_PIC1);
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    /* ICW4: i8086 mode */
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    /* ICW4: i8086 mode */
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    outb(PIC_PIC1PORT2, 1);
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    outb(PIC_PIC1PORT2, 1);
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