Vintage Zenith Data Systems Xebec Disk Controller Board - I cannot identiy the board but came out of a z-150 or z-100 computer with other boards dated 1983 that I have listed on ebay.  The board is manufacutred by Xebec and has serial # 11-050, one chip has a tag #44-365 C)84Zenith DATASY SCOR and another chip tag markings are not real clear, look like #1046S3A (not sure).  The board was not tested, but was pulled from a working machine.