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in this architecture reflects the legacy of earlier 80xx processors, which initially could only address 16 KB, or later 64 KB of memory (16,384 bytes or 65,536 bytes, respectively), and whose instructions and registers were optimised for the latter. Dealing with larger addresses and more memory was thus comparably slower, as that capability was somewhat grafted-on in the Intel 8086. Memory segmentation could keep programs compatible, relocatable in memory, and by confining significant parts of a program's operation

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