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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2all the citations have been taken down :( – Jacob Krall Oct 23 '22 at 18:20
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@JacobKrall The first one's still up. The latter two are down. – ssokolow Oct 25 '22 at 00:24
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Weird, it wasn’t working last night, or maybe I clicked the wrong link. Thanks! – Jacob Krall Oct 25 '22 at 00:41
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Ohh you edited it haha – Jacob Krall Oct 25 '22 at 02:54