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DEC Alpha
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==Memory== The Alpha has a 64-bit linear [[virtual address]] space with no memory segmentation. Implementations can implement a smaller virtual address space with a minimum size of 43 bits. Although the unused bits were not implemented in hardware such as [[translation lookaside buffer|TLBs]], the architecture required implementations to check whether they are zero to ensure software compatibility with implementations with a larger (or full) virtual address space.
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