I have a Umax Apus 2000 (SuperMac C500), this has been upgraded with a Phase5 Aptus G3/300 processor. All I am trying to do is upgrade the memory to the maximum of 144MB, by installing 2 64MB EDO dimms (replacing the 32mb and 16mb dimms I currently have installed).
I've now purchased three sets of supposedly suitable memory from different vendors, and they all give me the same problem. With both new dimms installed the Mac chimes, but doesn't boot (no video). With one installed (and one old dimm), the Mac boots but then crashes with a "bus error" even when extensions are off.
snip
64MB (8x64-60ns) 5V Buffered EDO DIMM listed as suitable for C500/600 with or without upgrade cards.
I have this very setup (2 x 64 MB and Phase5 Aptus G3/300 MHz) and no problems at all. So I do not think it is the processor. However, when I orignally bought the RAM the German vendor was very reluctant to sell it to me, because he said he had heard of stability problems of the Apus machines with the RAM maxed out (I have no other report of this stability problem, though). Perhaps this applies to you? Have you bought RAM chips of the highest quality?
Nils
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