db25 to 8 rca cable for integra research rdc-7

i recently bought the rdc-7 for a second system and wanted to hook up my panasonic dmp-bd80 to the 8 channel inputs to use the new formats but need to use the db25 inpits for multichannel analog and i have searched everywhere for this cable onkyo and integra both dont carry it and cant tell me the pin configuration so i could have one made ive seen that people have bought some of these snake cables with no luck getting all the speakers to work any advice would be a great help thanks