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About Raptor007

  • Birthday 11/07/1983

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    Seattle, WA, USA
  1. Raptor007

    Powermac 9600 G3 problems

    You might be having problems with Speculative Access. Basically, all modern CPUs guess what instructions might come next, execute them, and then keep or discard the results. This is a problem when the CPU guesses I/O instructions that change the state of something, and G3 upgrades in Old World Macs tend to make these bad guesses. The symptoms are random stability issues, data corruption, and failure to boot. Fortunately, someone made an extension called ROM Fixer which disables Speculative Access, and I found a copy on the Wayback Machine (also attached to this post). In my G3 upgraded 9600, this solved all my problems except the occasional failure to boot; the three-finger salute gets it going after one or two tries. I have the extension installed in both System 7.6.1 and Mac OS 9.2.2, and it's probably compatible with every version of the classic Mac OS a 9600 can boot. http://macos9lives.com/smforum/index.php?topic=2656.msg27281#msg27281 ROM_Fixer.sea.hqx
  2. Raptor007

    Questions about LC040 and 16 bit bus

    Fortunately mine's an MC68040RC40A marked 02L88M, which apparently means it's a more recent production with a smaller die: http://eab.abime.net/showthread.php?p=647148#post647148 But I should probably pop a heat sink on there just in case. I bet I've got something in my basement parts dungeon that would work. Oh, and is there a way to monitor the temperature?
  3. Raptor007

    Questions about LC040 and 16 bit bus

    Does the full '040 run hotter than the LC040? I just did the swap in a Performa 575 without adding a heat sink and it seems fine, but I didn't really stress test it or check the temperatures.