Original Apple, fully tested 75 MHz Rev. A Logic Board with 8-bit sound for the Power Macintosh/Performa 5200.
Apple introduced updated versions of the 5000 series several months after introduction referred to as Rev. B with some revised parts that are not backward-compatible.To determine the version you are servicing, remove the front bezel and note if the speakers are part of the front bezel (Rev A) or attached to the sides of the metal chassis (Rev B).