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IBM System/370
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==S/370 replacement== IBM replaced the System/370 line with the [[IBM System/390|System/390]] in the 1990s, and similarly extended the architecture from ESA/370 to ESA/390. This was a minor architectural change, and was upwards compatible. In 2000, the System/390 was replaced with the [[IBM System z|zSeries]] (now called IBM Z). The zSeries mainframes introduced the 64-bit [[z/Architecture]], the most significant design improvement since the 31-bit transition.{{citation needed|date=October 2009}} All have retained essential backward compatibility with the original S/360 architecture and instruction set.
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