This technique uses the unused address lines of the microprocessor as chip selects for the memory chips. This method is use for small systems.
The principal advantage of this method is that it does not require any decoding hardware. However this approach has some disadvantages; although with a 16 bit address bus we have 64k bytes of RAM space we are able to interface only 6k bytes of RAM. This means that this idea wastes address space. The address map is not contiguous; rather, it is sparsely distributed.
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