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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
by matja 21d ago
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.
- phire 20d agoAlso, even if ignored the fact that it was a co-processor, we don't generally count the width of the floating point and vector registers. Otherwise most modern CPUs would be labeled as either 256-bit or 512-bit. These days we generally label CPUs based on the width of the general purpose registers (though, it gets messy with things like the 68000). I personally suspect we won't ever see GPRs wider than 64 bits.