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In first generation and second generation computers there was no concept of architecture, the implementation was the architecture and every model of computer was totally different. Software portability did not exist, unless both machines were identical models with no custom features (and custom features and modifications were common). Only in third generation computers starting with the IBM System/360 in 1964 was the concept of computer architecture as something separable from implementation created.

Note: this same problem happened in the 1970s with first generation (4 bit & 8 bit) microprocessors. But at least with microprocessors it was corrected in the second generation (16 bit) processors.

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