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root / lab4 / .minix-src / include / i386 / ports.h @ 13

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/* Addresses and magic numbers for miscellaneous ports. */
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#ifndef _PORTS_H
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#define _PORTS_H
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#if defined(__i386__)
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/* Miscellaneous ports. */
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#define PCR                0x65        /* Planar Control Register */
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#define PORT_B          0x61        /* I/O port for 8255 port B (kbd, beeper...) */
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#define TIMER0          0x40        /* I/O port for timer channel 0 */
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#define TIMER2          0x42        /* I/O port for timer channel 2 */
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#define TIMER_MODE      0x43        /* I/O port for timer mode control */
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#endif /* defined(__i386__) */
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#endif /* _PORTS_H */