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The Z80 was introduced, as I understand it, at a clock speed of 2 MHz. Later, Z80-based computers at 3.5 MHz started showing up.

In what year did this faster clock speed become available? (In production quantity, not just samples.)

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The Zilog Z80 (2.5 MHz) was introduced in 1976.

In 1977, the Z80A (4 MHz) was available for $65 for the ceramic package and $59 for the plastic version.

The Z80B (6 MHz) was available in August, 1980 (p. 18) if not earlier.

The Z80H (8 MHz) was introduced in October, 1982 (p. 1).

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    all the citations have been taken down :( Commented Oct 23, 2022 at 18:20
  • @JacobKrall The first one's still up. The latter two are down.
    – ssokolow
    Commented Oct 25, 2022 at 0:24
  • Weird, it wasn’t working last night, or maybe I clicked the wrong link. Thanks! Commented Oct 25, 2022 at 0:41
  • Ohh you edited it haha Commented Oct 25, 2022 at 2:54

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