Virtual MemoryWhen in Protected Mode, applications provide "Linear Addresses" instead of physical ones. A Linear Address is 20 bits wide and ranges from 0x00000 to 0xfffff with disregard of actual availability of physical memory. Linear addresses get eventually translated into physical ones as part of every bus cycle.
It follows that the system can commit to applications more memory than that physically available. Different techniques (such as Swapping) are employed to honor the commitment. However, such a job belongs to the Operating System whereas the CPU limits itself to provide the address translation mechanism and protection support, which is hardware-based.
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Homebuilt CPUs WebRing
JavaScript by Qirien Dhaela
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.
You will need to copy this code fragment into your page.
Project start date: May 13 of 2009
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