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trag

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Everything posted by trag

  1. trag

    Recapped my 840av

    You're welcome. I'm glad it helped.
  2. trag

    Recapped my 840av

    There are many favorite methods out there but my personal favorite is still the two soldering pencil method. I've gone from a pair of 15W pencils (which takes too long and encourages boring/prying) to using a pair of 35 - 45 watt pencils. I liberally apply liquid rosin to both joints, then apply both pencils and wait for the capacitor to gently lift off. This also seems to quickly apply enough heat to melt any remaining glue point in the center. Last year I de-capacitored a box of ~20 IIcx boards using this method without any lifted pads. However, with all these different methods, skill/practive may play a part in avoiding lifted pads. Certainly, patience does. Regarding pencil power and the two pencil method. If you're doing tiny surface mount resistors, like the work described in articles on Marc Schrier's Clock Chipping Home Page, then a pair 15W pencils is good. For these physically larger capacitors, which are often sitting on a trace with a short run to the ground or power planes, a pair of 35 - 45W pencils works much better. Thinking about how I use the pencils during cap removal, I don't apply any downward or upward force with the pencils, but I do sometimes gently press inwards towards the center of the cap from both sides. This helps it to lift off when the solder and glue are loose.
  3. trag

    IIci with a surprise inside!

    Ah, nice gamble. Congratulations. That one was from Tacoma, yes? I messaged the seller asking if there was any memory in the machine when he tested it, because the description said no video. My thought was that if a memory bank was empty it might not produce video, but if memory was installed, then it was probably a battery bomb. The answer I received was that all eight slots were filled, so I skipped it.
  4. 3.5" Magneto Optical was the way to go. They were about the same speed as ZIP, but in that time frame, held 640 MB per cartridge and the cartridges cost about the same as Zips. The difference was that the MO drives were still about $250 when the Zip drives were closer to $100.
  5. Back when there was a fairly convincing rumor that there was a ROM that would let the ANS boot into the Mac OS. Whether that ROM actually existed and whether it ever escaped Apple are interesting questions.
  6. A 9500 ROM will not be sufficient. True, they both use the same chipset and architecture. However, interrupts on both are collected at the Grand Central chip. They are physically wired differently on the ANS from how they're wired on the 9500. The ROM needs to reflect that these interrupts are associated with different devices on the ANS from the ones they service on the 9500. There's a nice table comparing the interrupt configurations in the ANS developer notes that I referenced earlier. It would also be nice to add native drivers for the ANS SCSI chips...
  7. trag

    Recapped my 840av

    I've found a block of modeling clay to be useful for this. I cover nearby endangered components in a bit of clay to A) keep them in place, B ) protect them from heat. Available at Hobby Lobby and similar.
  8. trag

    Recapped my 840av

    Don't tin both pads. Lightly tin one pad per capacitor. Set the capacitor in place. Gently press down on the top of the capacitor with the eraser end of a pencil, or a flat screwdriver, or other blunt object, to hold it in place, while you work. With your other hand, apply the soldering pencil to the tinned side. The capacitor should sink into the solder down to the pad. To get a good solder joint, you need to heat both the pad and the terminal on the capacitor to the melting point of the solder. Don't just melt the solder and let it flow around. Be sure to apply the pencil to the pad and the cap terminal as well. After settling the cap on the soldered terminal, remove the soldering pencil. Wait a few seconds. Remove the object holding the cap down. Now solder the other terminal the normal way. Touch the pencil to the terminal and pad simultaneously, and apply solder.
  9. trag

    Connecting a ZIP drive to a Macintosh Plus

    The Mac Plus lacks internal SCSI termination. So, you either need a really short SCSI cable, so that both ends of the SCSI chain look like one end, electrically, or you need a pass-through 25 pin terminator between the Plus and cable. This may not be your only problem, but it can be a problem.
  10. It might look messy, but have you considered splicing new cable in at the two connector ends and replacing the middle segment?
  11. The C500 was based on the x400 architecture. I'm not sure if the 6360 is in the same family. Alchemy? Tanzania? Something like that. The 6360 was the first model in that whole larger line (5200/6200 - 5500/6500) that I liked.
  12. Someone may have posted it, but I have not seen it. I just checked the Hardware Developer Notes and on page 21 it states, "The Network Server 700 power interconnect system pinout is available from Developer Support. Meaning that back in the day, if you were a registered developer, you could contact Apple's Developer Support group and they might provide the information. http://www.erik.co.uk/ans/HardwareDevNotes.pdf Someone may have done so and posted it, somewhere.
  13. trag

    Bolles finds

    Cool stuff, Bolle. So do you pretty much have all the info you need to replicate the PAK upgrade, except, maybe, the schematic for the board? Also, I am curious where you found the GAL listings, etc.
  14. You might remove the heat sink and check the pins of the cache chips for stray heat sink grease. I had an X100 G3 upgrade once with similar problems. Enabling the cache crashed the computer. When I removed hte heat sink and took a look, I found that they had dribbled heat sink grease across the cache chip pins during manufacture.
  15. It seems to me that if one does a thorough Distilled Water rinse after a Dishwasher cleanse, that should take care of any dissolved minerals in the tap water used by the dishwasher. Everyone seems to have their favorite methods and some of them may not be ideal (perhaps none of them) but all the methods seem to work well for a bunch of people based on the reports we read. I'm made nervous by the twisting and cutting of caps. But then, I've never had any trouble with lifted pads when simply desoldering caps. That said, based on all the glowing reviews from folks who use twisiting or cutting, I must conclude that those methods work well too.
  16. trag

    Bolles finds

    Nice haul. Good luck with the GALs. Boy, that has a different meaning amongst non electrical types.
  17. trag

    Scored a IIfx lot with extras

    The 8530 and the Static RAM chips are available (or were). As long as you can save the IOP and are able to repair the traces, if should be fixable. Nice project.
  18. Is there room in the Mini for the PATA to SATA converter?
  19. You may wish to consider a PATA to MSATA adapter and an MSATA drive. Or, if they make such an adapter, a PATA to SATA M.2 adapter -- M.2 being on the rise and MSATA probably not as popular now. I don't know how rare and expensive 2.5" PATA drives are, but it could cost you the same or less to go the adapter to SSD route.
  20. I have seen reports of folks recapping automotive computer modules and resurrecting them. Can't remember where. Either in a car specific forum or on Bad Caps. Heck, I resurrected my 20 year old sprinkler system controller with caps replacement and my old VCR. Caps are used to smooth power. When they go bad, often microcontrollers are no longer getting reliable power and so they behave erratically.
  21. I was referring to the one that W’rkncacnter linked to above over on os9lives. Sorry for the confusion.
  22. I added a post to the 9600 guide. Slot order may matter, but it is not because of slots that don't support bus mastering. They all support bus mastering. But that canard was repeated many many times on websites and in fora back in the day. It will live on...
  23. Apple sold off a large stock of OEM Twin Turbos when they discontinued the 9600 -- well sold them as a batch and then resellers sold them retail. They were very cheap at the time. Many folks wanted the more extensive controls provided by the IxMicro software. So ROM swapping happened. There were about 30 people on the SuperMacs email list alone who bought programmed Flash or EEPROM chips with which to convert the OEM TT cards.
  24. I recently received a lot of logic boards and sundry via Ebay, and there are two P600 boards included. I thought they were IIvx at first, until I discovered that the P600 is just like the IIvx, except for the lack of cache and FPU. So those solder pads are just sitting there, staring at me. Almost chanting, "Populate us with SRAM and TAG RAM chips...." Anyone done it or read about it?
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