Thanks for the interest in my post, here are some replies: Kris Tilford Gerald W. Wilson<[EMAIL PROTECTED]> wrote:
>Most interested by your post. I am beginning to suspect that the various >problems I'm seeing with a number of configurations are all ultimately >down to the combination of things connected to SCSI bus zero. >F'rinstance: I could do an XPF install of 10.1 from an external Apple >CD, but not from the otherwise identical internal CD. >Do bear in mind that SCSI has always been temperamental. I guess you >don't want to fiddle now, but you need to scrutinize every component of >your internal SCSI chain for compatible settings: unique id (natch), >termpower, terminated or not, etc. Sometimes, just reordering the >devices on a SCSI chain will clean up the behavior. It's a bummer. Yes, a bummer. I previously posted a link to an excellent article from the newsgroups that will help anyone clear up SCSI voodoo problems (link below). I don't think my problems were at all related to ID #'s, termination or device order. My final test was the Apple CD, id 3, terminated, on a short 6" single device cable. There was nothing to interfere, and the CD wasn't recognized to boot from, but worked fine after a floppy boot, and works fine to boot from now off the other SCSI bus. >I have to say that I have built several 7500s with a standard fit of >Apple CD (id3), "Fast" disk (such as 2G or 4G Fireball, or Barracuda) >for System Disk X (id1), and "slow" disk (such as 1G or halfG Fireball >at end of internal cable and terminated) for System Disk 9 (id0), and >never had problems with this simple config. Problems only arise when I >get ambitious and add more drives, or try more sophisticated drives on >internal SCSI. This is my identical setup also, except that I use id6 for the fast disk to give it priority in the SCSI chain(priority order is 0,6,5,4,3,2,1). >If I can identify a smokin' gun on SCSI, I'll post. Thanks! ------------------------------------------------------------------------- Will Schou <[EMAIL PROTECTED]> wrote: > Your not the first person to find they could install OSX of one >version or another on the slower external SCSI but not the internal >faster SCSI. Many of these people found that after doing the install of >OSX and getting things to work they could then move the ribbon cable >over to the faster internal bus and it worked fine! I installed all my OS X on the internal bus, so that wasn't the problem. I have tried switching back several times, and it just doesn't work on either of my two 7500's. >Do you know or >notice that XPFacto has a throttle option at the top which slows the >cpu down for the booting process then goes back to normal speed? Yes, I'm aware of the throttle, but there seems to be a misunderstanding of what I was reporting as a problem. I do not have a problem booting OS X via xPostFacto from HD or from CD. When it boots, it boots fine. The problem is with the internal SCSI bus being flaky in Jaguar version 10.2, and not recognizing my drives or CD after certain shutdowns or freezes. Once the boot process starts, it continues fine. The kernel panics I reported were during the boot from 10.2 CD for the initial install of 10.2. This is where I saw all the SCSI error messages in the verbose panic printout, which I sent to Ryan Remple. He said he was aware of this problem, and had fixed it in xPostFacto 2.2.4. The thing that Ryan fixed was the ability to boot from CD and install 10.2. I think there is some other problem with 10.2 with the internal SCSI bus that doesn't effect the external SCSI bus. >XLR8 Mach Speed >Control no longer works after maybe 10.1 maybe earlier or so not sure >exactly but It doesn't work at all with Jaguar. So you are running with >no backside cache if using it! Hum. It seems to work fine in 0S 9.1, and since 9.1 is necessary to get into 10.2, perhaps it is already initialized? I have CPU Monitor in my System Preferences and it shows the backside cache as working. I have wondered though, since the Mach Speed Control doesn't do anything in 10.2 except 'launch' with no visible result or control panel like in 9.1? ------------------------------------------------------------------------------ -------- Bruce Johnson <[EMAIL PROTECTED]> wrote: >These are very similar to the symptoms I ran into when I had bad ram >installed. >In my case the internal bus simply stopped working, One new motherboard >later, I realized it must be my G4 upgrade that went south. Put the >original card back in, everything worked... >It wasn't until I upgraded my ram, and IT didn't work, that I went >through an extensive testing of the ram. In my case all the DIMMS >worked individually, but it was mixing some old 8, 16 and 32 MB sticks >(2K refresh, most likely) with some new 128's (4K refresh) that brought >out the problem. With these sticks removed, everything, including my G4 >card and OSX, and my internal SCSI (on BOTH mobo's!) worked... Yes, I have considered this. One 7500 has two 4k 128mb EDO interleaved. The other has a bunch of 32, 16 & 8mb 2k interleaved. I have experimented both interleaved and not, with not much difference. I must admit that I suspect the 4k 128mb EDO. I bought it from Coast-to-Coast, and have killed two sets. In the most recent warrantee I wrote saying that if they didn't have any 4k EDO that would work with G4 upgrade cards, to please inform me, and that I'd apply my credit toward 2k dimms that would work. They sent 4k again. I'm happy with the lifetime warranty, but unhappy with the product. I don't think it's the memory though. I've had bad simm memory in a 7100 w/G3 card, and it behaved very differently. The simm memory problems I had would damage the files on the HD's, and programs would spontaneously halt, but there was always an error message on the screen. The problems I had were cured totally not by switching memory, but by changing SCSI buses. (I did try switching memory between the two). I've only run the Techtool 3 memory test, and it passed. The bad simm failed. Is there a more rigorous test I should r un? ------------------------------------------------------------------------------ ---------- Link to excellent SCSI article (cached on Google): http://groups.google.com/groups?q=SCSI+group:comp.sys.mac.system&start=10&hl=e n&lr=&ie=UTF-8&selm=1eunr5f.lo2wcx127vcqyN%40usr2712-cro.cableinet.co.uk&rnum= 15 -- Unsupported OS X is sponsored by <http://lowendmac.com/> Support Low End Mac <http://lowendmac.com/lists/support.html> Unsupported OS X list info <http://lowendmac.com/lists/unsupported.html> --> AOL users, remove "mailto:"; Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive <http://www.mail-archive.com/unsupportedosx%40mail.maclaunch.com/> Using a Mac? Free email & more at Applelinks! http://www.applelinks.com
