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The original Z80 was first released in July 1976. Since then newer versions have appeared with exactly the same architecture but running at higher speeds. The original Z80 ran with a clock rate of 2.5MHz, the Z80A runs at 4MHz, the Z80B at 6MHz, and the Z80H at 8MHz @https://landley.net/history/mirror/cpm/z80.html.

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