The Centris 610, Quadra 610, and Apple Workgroup Server 60 have 4 MB of RAM soldered to the motherboard and two 72-pin SIMM sockets for memory expansion as far as 72 MB.
1999 – RK writes: I just got this old Quadra 610, and the only way I am going to get rid of this wonderful box is if somebody pries my cold lifeless fingers off of it’s case. :)
It is out of sheer desire to help others overcome the year-long disaster that I went through, that I would like someone to be able to document this somewhere. Please take note, this affects all Centris 610 and Quadra 610 machines, but not the 660av.
Finding the market confused with five product lines (Mac II, Centris, Quadra, Performa, and PowerBook), Apple renamed the Centris models in October 1993.