X-Hacker.org- Interrupts & Ports

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        Port 041  -  8253-5 Channel 1

        Used to time the memory refresh cycle. Operates in mode 2
        (see port 043) with a divisor of 18, causing an interrupt
        to the 8237 DMA controller every 15.08 ms. Do not disturb
        (can result in PARITY CHECK).

See Also: 8253-5 043 8237A-5 000 001

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