The logic board slides out the back, same for all 500 and 5000 series all in one Macs.
This will show you how. http://tim.id.au/laptops/apple/legacy/performa_500_series.pdf To remove the 72 pin SIMM, pull the latch at each end of it outward and the SIMM will pop over at an angle. Pull the SIMM out then insert the new SIMM at that same angle then push upright until it snaps into the latches at both ends. There's an offset notch in the bottom edge of the SIMM. Make sure to install the new SIMM with the notch in the same orientation as the old one. You can upgrade to a 57x (575/577/578 all the same Mac with different base configurations) board. Most of those shipped with an LC040 CPU but that can be swapped for a 68040 with FPU. Those boards can also use a 128 meg SIMM to get 132 meg RAM. Has to be a specific configuration of SIMM, can't use just any 128 meg SIMM. Another benefit is 512K VRAM VS 256K. Unless you get a board with two VRAM SIMMs you'd have to buy one and move the one over from your 550. -- ----- You received this message because you are a member of the Vintage Macs group. The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to [email protected] To leave this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/vintage-macs Support for older Macs: http://lowendmac.com/services/
