In terms of what is the absolute oldest - again depending on your exact definition of "family", z/System is arguably the oldest computer family, you can trace a direct lineage back to punchcard tabulation programs, which date back into the 1880s. Active development/new chips being released? Still in widespread legacy use? One-off legacy systems still hanging on in an industrial installation somewhere? I realize neither of those are probably the absolute oldest, but this is going to hinge on what each commenter's exact definition of "families" and "still in use" are. Z80 also dates back a really long time, and there is a ton of stuff that still uses Z80-family processors in many embedded applications (microwaves, calculators, etc). Depending on how you delineate the families, the origins of x86 date back to 1972 (Intel 8008) and obviously x86 itself dates to 1978 )
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