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| | CPU Guide: the first CPUs |
 | | Intel was contracted to create a custom chip for a desktop calculator — the firm had done three or four of those already — but decided it could do the job more efficiently with a flexible, multi-purpose chip, which could be re-used again and again in different applications. |
 | | The 8085, Intel's replacement for the 8080, had considerable success, but always played second-fiddle to the Z-80. |
 | | Secondly, for some incomprehensible reason, Intel chose to organise its memory access in such a way that IBM felt constrained to limit the theoretical maximum RAM of the original PC to 640k. |
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