httpproxy.gopherspace.dk:75/1/proxy/https://bitsavers.org/pdf/burroughs/MediumSystems/B3700_4700/

       Index of /pdf/burroughs/MediumSystems/B3700_4700
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   DIR /pdf/burroughs/MediumSystems
       1063773_Medium_Systems_Input_Output_Subsystems_and_Data_Communications_Reference_Manual_Dec1972.pdf
       1063799_B3700_B4700_Central_Processor_Dec1972.pdf