First post, by Arbuthnot
Hello all, new here. I've acquired a Dell 486SX (433s/x) motherboard to rebuild my dead old PC from when I was a kid. I am struggling to find much information on it but it appears to be this board: https://web.archive.org/web/19970224223616/ht … 86L/default.htm It is working OK with the 4 old 4MB 72-pin chips from my dead IBM, but I was hoping to upgrade it to 64MB total so I picked up some 16MB SIMMS from eBay. The board will POST with any one of them and shows 16MB installed, but it won't take more than one. I realised that I had bought 60ns memory and the board details linked say 70ns - could that be why it will not take more than 16?