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Betamax vs VHS, and similarly BluRay and Netflix won eventually. (modern PCs don't use 8086 either).

For the same reason VHS beat Betamax, the 6809 should have won, because it had the SEX instruction.

VHS beat Betamax mainly because the cassettes were larger, allowing for longer recording time.

I still remember chortling at that mnemonic as a teenage assembler programmer.