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The wild world of non-C operating systems

Arthur the cat Silver badge

And before that, nightmare territory of having to program directly at the per-bit level, by "literally" throwing the switches.

There was a stage before switches. I never did it but an older friend had the experience of "programming" hardware by plugging brass and ferrite slugs into a pinboard that then got inserted into an array of induction coils. Brass (non-magnetic) was 0, ferrite (magnetic) was 1.

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