Index of /pdf/ibm/370/channel
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   DIR /pdf/ibm/370
       GA22-6845-3_IBM_System_360_System_370_Direct_Control_and_External_Interrupt_Features_OEM_Information_Jul1971.pdf
       GA22-6974-4_360_370_IO_Interface_Channel_to_Control_Unit_OEM_Information_Jan78.pdf
       GA22-6974-7_360_370_IO_Interface_Channel_to_Control_Unit_OEM_Information_Sep1984.pdf
       GA22-6974-8_360_370_IO_Interface_Channel_to_Control_Unit_OEM_Information_Mar86.pdf
       GA22-6974-9_360_370_IO_Interface_Channel_to_Control_Unit_OEM_Information_Feb88.pdf