MikeatOSX
Well-known member
This is a great PDF to identify 68k hardware:
http://bitsavers.trailing-edge.com/pdf/apple/service/PN_072-8124_Apple_Service_Module_Identification_Manual-Jun_1994.pdf
http://bitsavers.trailing-edge.com/pdf/apple/service/PN_072-8124_Apple_Service_Module_Identification_Manual-Jun_1994.pdf