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refresh cycle. This could also be accomplished by other integrated circuits already being used in the system, if these already generate cycling accesses across RAM (e.g., the Motorola 6845). In CPUs such as the Z80, the availability of a RAS refresh was a big selling point due to its simplifying hardware design. Here, RAS refresh is signaled by a unique combination of address and control wires during operationally redundant clock cycles (T-States), i.e., during

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