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Simon_Carr

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    Oxford, UK

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  1. Simon_Carr

    Use PowerPC for a week?

    Aah, I used to love my old G4 iBook, and was heartbroken when it finally failed... it had a long and very hard life accompanying me to the tops of numerous Icelandic glaciers to download data from some weather stations... The Macbook I replaced it with has never quite been the same, and although that still works and is regularly used by my wife (its only 9 years old, by which i mean the MacBook, not the wife!), it just hasnt left me as nostalgic about it compared to my iBook...
  2. Simon_Carr

    Use PowerPC for a week?

    Just a little bump on this, as no-one has posted on this one for a while. I use an eMac G4 usb 2 for work on a regular basis, and I keep a G4 (800 mhz) iMac as my main music system at home (with a Harman Kardon Jellyfish, of course!). I prefer the richness of the excellent CRT on the eMac display over my iMac Retina, particularly for doing graphics work. For some reason, I find it far less stressful on the eyes. I also run old versions of excellent software, like the final version of CorelDRAW for the mac, and some superb data analysis software called Aabel on the eMac (I cant afford the license cost for the most recent version). Houseguests always comment on how cool the iMac looks (and how much noise it can generate!)... Just because it's old, doesn't mean it's no good!
  3. Simon_Carr

    Shutdown issues...

    Thanks for the suggestions, but it was definitely a problem with the keyboard... I've tested the system again since my last post, and my observation about the same fault happening with a different keyboard hasn't been repeated, and the Centris has been shutting down just fine, and staying shut down. I'm just awaiting a new Apple Design Keyboard (and an ADB trackpad!) to arrive, and then I hope to be back up and running! Cheers, Simon
  4. Simon_Carr

    Start-up problem Centris 650

    Sorry for the late response but I do have a copy of Mathematica installed on one of my hard drives, but I don't know how good or complete it is. It actually came with the Centris when I bought it (along with early MATLAB, and a few other scientific data analysis packages), but since these startup (and a few other) problems arose I have removed the drive, cloned its contents into a disk image for safe keeping against the day when I get my Centris fully back up and running... Not sure whether the application folder contains all the files and additional bits needed to install Mathematica, but once the Centris is fully back online (literally), I will see what I can do!
  5. Simon_Carr

    Shutdown issues...

    It is a Centris 650, with a pile of other stuff tucked into it... I've been doing a few tests, having stripped the whole thing down, checked the main circuit board (everything looks fine, but I gave it a clean anyway) and no peculiar sounds or smells when it powers up. HOWEVER, I realised that there was something not quite right with my keyboard (some keys were not working), so removed that and just connected the mouse to an ADP port, shut the mac down, and it was fine. AHA! So there is a stuck key or something mechanically wrong with the keyboard. I swap the standard keyboard for one that is on my classic (and which I know works perfectly fine) and lo and behold, the computer immediately starts up again without being prompted. So, I am sure it must be something to do with the power-up key signal that comes from the adb keyboard that is triggering the mac to start-up: however, the thing is that it must be a fault in the Mac, as the same issue is repeated with both keyboards... Any further insight very gratefully received!
  6. Simon_Carr

    Shutdown issues...

    Gave it a try, but no change....
  7. Simon_Carr

    Shutdown issues...

    Thanks for the suggestion, i'll give it a try, but I recapped the whole thing last August, and it has a new PRAm battery in it...
  8. Simon_Carr

    Shutdown issues...

    Hello, back again now that the autumn/winter has returned and I've put down my bike and picked up my Centris again... Bit of an odd question here, but I'm a bit foxed... My Centris starts up okay, but when I come to shut it down again, it does that just fine, but then instantly restarts. I've had a look at the sprung power button on the back of the computer, and that seems to be mechanically fine, but before I take the whole computer apart again, I just wanted to check if there is something really obvious I'm missing here? My guess was that the on-off button at the back of the computer was sticking, but I don't know if there is any other thing I should be looking for... Any suggestions gratefully received...
  9. Simon_Carr

    CD Drive issue...

    Nope! Still getting problems with the CD-Rom drive connected.... The Centris starts up okay, and then can open up software (in this case the Apple Personal Diagnostics tool), but then it seems to hang. If I try to Force Quit, the system software just hangs, although Command-Alt-Esc still opens up a force quit dialog box, but does nothing. If I dont have the CD connected, it seems to run just fine! Confused....
  10. Simon_Carr

    CD Drive issue...

    Thanks for that information, Macdrone; it looks like I may have found an issue, as my CD-Rom drive had jumpers for all 3 SCSI ID positions (0,1,2). I have just removed the jumpers from 0 and 1, and the Centris seems to have booted up okay so far. I still need to check that everything is working, but so far so good.... A case perhaps of too many, rather than too few jumpers? It does beg the question why this has become a problem recently, rather than for all the years of potentially confused SCSI IDs...
  11. Simon_Carr

    CD Drive issue...

    I think there is something not right with the cd-rom... I removed the SCSI but kept it powered, and out popped the caddy.... Having thought I had got my Centris back up and fine, when I reconnected the CD rom drive, it all went pear shaped again! Back to having a ? Floppy disk warning on startup. So, having re- re- re-installed the system, I have left the CD drive disconnected, and the Centris seems to be working okay again. I'm wondering whether I have lost a jumper on the back of the drive for the SCSI id, and that the system is trying to boot from CD, which of course is cannot do? That's my guess anyway... Does anyone have a Sony CD Rom drive that they can take a pic of, so I can see if I am missing a jumper?
  12. Simon_Carr

    CD Drive issue...

    Okay, my Centris is back up and running, but I'm continuing to have problems with the CD drive in the system. It is an original CD drive with Caddy (I think it was made by Sony), and when I started having problems with the Centris, I inserted a System 7.5.3 CD in a caddy into the drive. To cut a long story short, I simply cannot eject the CD now: the drive is trying to eject when I request it, but the caddy seems to be stuck. Does anyone know if there is a way I can get this caddy and CD out? I have tried to push the force eject button using a paper clip in the small hole to the right of the caddy aperture, but although the drive is trying to do something, it just seems to be stuck. I'm not sure if I can open up the CD drive.... Any tips before I potentially break it?!
  13. Simon_Carr

    Start-up problem Centris 650

    SOLVED! It turns out there were a couple of separate things that needed sorting out... The installation of Mathematica messed up the Desktop File on the Mac SSD (My SCSI2SD), which I believe is stored in the NVRAM, so no matter how many times I zapped the PRAM (which I did many times), was resulting in the hang-up whenever I tried to start up, be it from the SSD or from the Disk Tools 1 floppy disk. Good old command/alt during startup allowed the rebuilding of both the SSD Desktop File and the Disk Tools Desktop File, which allowed the Centris to reach full booting up. It turns out my SCSI lead was defective, albeit only intermittently (last time I use a new cheap Chinese replacement part bought on eBay!). I went back to basics, and used a simple (just one SCSI connector) cable from another Classic, and managed to get the SCSI2SD detected and working! I've now added a two connector cable (again scavenged from an old mac), and both the CD and SSD are detected. So, hopefully the problem is solved... I'm currently re-installing 7.5.3 from a disk image kept handily on the MicroSD card, and it has just told me it was successful. Now for a restart to see if it boots properly from the SSD.... and, YES, WE HAVE LIFTOFF! So it took a bit of going back to basics, but I think I am finally back up again! Thanks for the suggestions, and I'm relieved to have this back up and running, I have spent a few pounds/dollars on this Centris, and would have been very upset if it was no longer working! Cheers, Simon
  14. Simon_Carr

    Start-up problem Centris 650

    Thanks for the responses, although sadly I have already tried both of these suggestions with no joy. The SCSI2SD works fine, as I checked it using my Mac Classic, just switching the microSD cards over as System 7.5.3 runs dreadfully on the classic. No problems with the hardware or firmware, which has been upgraded and repeatedly replaced. The MicroSD card is fine too, checked on my eMac and everything opened fine in BasiliskII. The CD drive has been disconnected for quite a while now, and is currently sitting in a plastic crate with much of the other innards of my Centric (additional RAM, HDDs, NuBus card etc...). Right now, it is just the floppy drive, logic board and power supply in there! I've also checked the SCSI cable (fine), so it must be something either in the on-board ROM, or elsewhere on the logic board that is causing the computer to hang at the very final stage of startup, before it mounts files and disks on the desktop. I don't know whether there is a specific area that deals with SCSI connections, but that would be my next guess, but I do not have the faintest idea where to start! Keep the ideas coming!
  15. Hello Again, Having got my maxxed-out Centris back up and running a couple of months ago, I've suddenly hit a problem. I was installing Mathematica on the Centris a few weeks back, when suddenly it all went awry; I don't think it was anything to do with the installation of Mathematica, but after doing that the Centris stopped working properly. In a nutshell, here is what has happened: The Centris started having real problems reading the SCSI2SD which is the main drive for the computer; I tried a whole range of different things relating to the SCSI2SD, but started getting system faults and errors, especially with regard to reading from any SCSI device; This culminated in the computer failing to start up at all. I cant remember whether I got a sad mac or bomb at start up, unfortunately. I removed the SCSI2SD completely, wiped the SD card and have been trying to do a re-install of the system 7.5.3 software, both from CD-ROM and Floppy Disks; Despite repeated attempts, the computer kept losing sight of the SCSI2SD and failing to install the system software. The computer sometimes saw the SCSI2SD, and would ask to initialise, but this would always fail after a short time. After one or two efforts, as well as not seeing the SCSI2SD, the Centris no longer read or recognised the CD drive Thinking it might be an issue with the SCSI2SD, I tried to install using a blank (but known to be working) Apple Hard Disk, from floppy disks. Still no joy; I have then just tried to get the computer to start up fro the Disk Tools 1 floppy. The computer starts up, and I get a happy mac icon, and the system boots up to the desktop, with the menu bar across the top of the screen. However, I don't get any disks appearing on the desktop (not even the floppy disk that is being used to drive the system), and the pointer just sits as the wristwatch, which is initially spinning (accompanied by sound of the floppy disk being read), but then freezes, and there is no noise from the floppy disk. At this point the computer hangs up; I can still move the pointer around the screen, but the computer is no longer responsive. I have repeatedly tried this startup, with the same result, even after leaving the computer for over an hour to see if it can get over the hang-up, but with no joy. I have checked the SCSI2SD in my mac Classic, and that is working just fine, as is the Disk Tools/System floppy disk, so it has to be something in the Centris. I have taken it apart, and checked cables, connectors etc on my Classic, and these are all working fine, and a visual check of the logic board hasnt highlighted anything obvious. Any suggestions regarding what I can try next? I will take the logic board out of the computer and give it a thorough check and (another) clean, but does anyone have any ideas where I should be looking? It cannot be a major problem, as the Centris seems to nearly get there, and when I boot from floppy the Centris passes all the initial checks that allow a happy mac to show, but I'm completely stumped! Cheers, Simon
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