Index of /pdf/sds/sigma/16-bit/sigma3
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   DIR /pdf/sds/sigma/16-bit
       901592B_Sigma3_RefMan_Feb70.pdf
       901593A_Sigma3_CPU_PrelimEngrDrws.pdf
       901593A_Sigma3_cpuTechMan.pdf
       901594A_Sigma3_core_Apr73.pdf