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how to work out a page size?

Hi I'm new :o: just discovered this place now and kind of need some help desperately, so excuse the directness of my post :o:

anyway basically this is what i need help on by today:

How do I work out the size of a page in a system? and the size of the address space of a process?

heres an example:

Processor A uses 32bit address with a 20 bit page number and a 12 bit offset.

How do go abouts to doing this?

thanks in advance

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