PeripheralsPeripherals are memory mapped and they may use interrupts for requesting CPU attention as well as DMA for direct data transfer to or from Main Memory.
Both Interrupt and DMA subsystems are designed in such a way that a peripheral cannot monopolize the bus during a data transfer operation. This is achieved by making the Computer's Clock Tic the highest interrupt priority of all so the Operating System can preemptively schedule all other interrupt service routine's tasks as well as DMA operations.
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Homebuilt CPUs WebRing
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Join the ring?
David Brooks, the designer of the Simplex-III homebrew computer, has founded the Homebuilt CPUs Web Ring. To join, drop David a line, mentioning your page's URL. He will then add it to the list.
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Project start date: May 13 of 2009
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