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当存贮一个诊断程序的输入装置不工作时,或它同计算机的接口发生故障时,同样还会存在诊断,但如果诊断存在 P/ROM 内部,则它与外部装置的故障无关。
Diagnostics are also present when the input device storing a diagnostic program is not operating or when its interface to the computer fails, but it does not relate to a malfunction of the external device if the diagnosis exists inside the P / ROM.