Index of /pdf/tektronix/44xx/service
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   DIR /pdf/tektronix/44xx
       1984-1-2-Pegasus-overview.pdf
       1984-qtr1-Pegasus-hw-design.pdf
       4404_CPU_Schematic_1985.pdf
       4404_Monitor_Theory_of_Operation.pdf
       4404_MSU_Theory_of_Operation.pdf
       4404_PSU_Theory_of_Operation.pdf