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mortjayesterday at 6:19 PM2 repliesview on HN

So in a sense the 8087 was the first 64 bit CPU?


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matjayesterday at 6:22 PM

I wouldn't say so, because it was a co-processor: e.g., it depended on the 8086 to even generate addresses for memory operations.

I think the IBM 7030 Stretch CPU (from 1964) would be a likely contender for being one of the first 64-bit CPUs.

kensyesterday at 6:40 PM

The Cray-1 (1976) was probably the first 64-bit CPU.

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