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About james_w

  • Birthday May 12

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    London, UK
  • Interests
    This and more... ;)

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  1. Thanks for your tips @trag and @Franklinstein, I don't think replacing the CPU heatsink compound would ever have occurred to me as a thing to fix. I think I've only done it once before many years ago. Sounds like I'd better be very careful! Time is super limited right now, but hopefully I can give that a go sometime in the Autumn
  2. Thanks for checking about that. I do have the PDS terminator installed. Sometimes on startup the computer reports a problem with the cache card. So I'm wondering if I need to give all the contacts in the ROM, Cache, and PDS slots a really good clean. If they're a little corroded perhaps the cards aren't always being seen, and could be the cause of the issues I'm seeing. I'm going to give it another try later today.
  3. Oh wow! And you're in the UK! I've uploaded one of my more recent stacks into that collection and it's super fun to explore being a mega HyperCard enthusiast myself
  4. The adapter I use has no settings or switches, just a pass through. I've replaced all the capacitors - see my original post. Thanks for the suggestions, I think it's more likely a faulty chip or a damaged trace somewhere on the board. I'll keep looking!
  5. It is an LCD, but worked absolutely fine at 832 x 642 with it until now. The video works fine from a Nubus card, and may well do from a PDS card too, but I'm trying to fix the *internal* video
  6. So I've been restoring a couple of WGS 9150s. One is an original (80mhz) and the other a 9150/120. The 9150/80 was exhibiting these issues regularly: crashing with type 1, type 2, and type 3 errors after some usage internal video sometimes had random pixels of noise (in random colours) here and there occasionally the internal video also didn't work, just a black screen on boot I figured this was all probably RAM related. I removed all the SIMMs and the problems were still there. So then I suspected its 8mb of DRAM soldered to the board. At this point I decided I might as well replace the 18 electrolytic caps on the logicboard and give it a good clean. The insides were rammed with dust and fluff! I think this machine had sat on someone's floor for years just sucking in all the dirt. It was quite a gross job. Anyway it's all clean and has shiny new caps installed. Now it doesn't seem to crash any more, but I get no internal video on boot, just a black screen. My monitor (an NEC 1880FX) knows there's something there as it comes off standby when I boot the machine, but it never gets a full signal. (as a side note - video works fine from a Nubus card) Anyone got any ideas? I suspect one or more of the DRAM chips has failed... or something else? I've searched for schematics in vain. Not sure where to go next diagnosing this.
  7. james_w

    Dynamac Smokin!

  8. james_w

    PowerBook Duo 250 death chimes

    It's not got a main battery nor a back up (PRAM) battery installed. I'll give the PSU a test this evening
  9. Hi all. I recently acquired a PB Duo 250. It had to sit in a drawer for a few months before I could get to it, partly because all my PSUs for Duos are in storage. I now have a working PSU but on boot all I get are death chimes. Apple service manual says this is a memory issue... and to replace the logic board. Obviously I would prefer to rescue this board rather than do that. It also has no video showing on the display. I replaced all the electrolytic caps and gave the board's top and bottom a general clean with IPA but still the same issue. I've also tried booting with and without an add-on memory board. Any ideas? Should I deep clean the board? Should I replace caps in the screen? Could it be an old PSU causing the issue by not supplying the right voltage/current? (I can test this easily) Any ICs or other components I should be checking?
  10. james_w

    Dynamac Smokin!

    BTW - any Dynamac users that don't already know this. There's an extension to make your Dynamac use the full screen resolution of 640 x 480, otherwise it defaults to 512 x 342
  11. james_w

    Dynamac Smokin!

    I think they may have been a gas plasma display, but all the Dynamacs I've seen, including my own have an electroluminescent screen. I think it's also why the model number has an "EL" in it.
  12. james_w

    Fitting a SCSI2SD in a 68k Mac

    Yes, I've only ever managed to successfully format a SCSI2SD with Lido. Not sure how other people have managed to use other software such as the patched HD SC Setup. I've tried using it multiple times and it's never fully worked. Enjoy your new faster Mac!
  13. james_w

    2x BeBoxes!

    Agreed, I'm one of them
  14. james_w


  15. Woo! Glad you found the time to document it and get it out publicly! Reminds me that I have a PCB that needs populating sitting in a drawer here...