80C86 microprocessors were manufactured using CHMOS technology. These CPUs have completely static design, i.e. they preserve the contents of registers when the clock is stopped. The standby mode on these processors does just that - CPU clock is stopped completely, and, as a result, the CPU has extremely low power consumption. Even when the CPU operates under normal conditions it has much lower power requirements than HMOS 8086. For example, this P80C86 processor has approximately 7 times lower power consumption than the Intel D8086.
Intel P80C86-2
Intel N80C86AL
Intel N80C86AL-2
Intel P80C86AL
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