IO_TIMER1 - DragonflyBSD

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#define TIMER_CNTR0 (IO_TIMER1 + 0) /* timer 0 counter port */

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#define TIMER_CNTR1 (IO_TIMER1 + 1) /* timer 1 counter port */

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#define TIMER_CNTR2 (IO_TIMER1 + 2) /* timer 2 counter port */

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#define TIMER_MODE (IO_TIMER1 + 3) /* timer mode port */