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About Trash80toHP_Mini

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    Bermuda Triangle, NC, USA

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  1. Apple made very deliberate engineering decisions to hobble low end and mid-market Macs from cannibalizing sales of the next higher tier. I always thought they should work harder at pushing high end system performance. Adjusted for inflation, the IIfx was probably the most expensive Mac ever released. Shipping it with but 32K of L2 and no attempt to develop/implement L3 Cache in a $10,000 workstation class machine was inexcusable IMO. The CC fit Apple's tiered marketing model like a glove. What was inexcusable form my point of view was releasing it without the stereo speakers of its
  2. I've only dialed in the SuperMac Spec/8 SI setup above to nearly perfect so far, but had some fun with rough setups for several. May have to start from scratch for my as the box has been sitting unplugged August. Maybe we should start a sister thread with only the data on on setup info? List the numbers to plug in for specific Macs/other platforms and specific Vidcards? That would leave this thread clear for helping each other developing the results for that table? I've been busy with other things in the meantime, but will get back to the IIsi Vampire Video setup on a
  3. Let the games begin! Original plan was to set up one BTI High Capacity circuit and a standard Apple Type III circuit for testing high capacity AA or AAA in holders on an A-B switch just to see what happens before sending the PIC board to sameone for reverse engineering. @bigmessowires didn't have time to take that on back then, maybe now or someone else might be willing to take up that task if I can get longer run time out of NiMH cells in the test setup. It won't match the fabulous Li-ion pack @sutekh came up with, but with the BTI PIC setup maybe you can get a better charge on th
  4. My ME brother told me the way to analyze the layers of a board is to set it up perfectly level and encase it in epoxy. In that state each layer is easily milled away and scanned. I'd told him I'd tried sanding and it wasn't a very effective approach if if done by hand. That was 30 years ago, cast resin should make it easy these days . . . assuming you have access to a milling machine.
  5. Have you got a working SE/30 or IIsi for testing? Just install it in the PDS, boot and run TattleTech to find specs of the card in the NuBus/PDS report.
  6. Great workup! Does it require drivers? Are all the ICs off the shelf or have programmable features/complicationss? PCB has how many layers?
  7. Yep, that's the baseline diagram, much clearer, but I thought you'd get more out of the one I posted with the standard Type III overlay. The PIC Board replaces the two wire EEPROM for sure. But though I don't think that board is super intelligent, it does fool the Duo's Power Manager into fully charging higher capacity cells. That's what's kept me curious as to the way it does that for all this time? ___________________________________________________________________ Power Manager IC The Power Manager IC is a 68HC05 microprocessor that operates with its own RAM and ROM. T
  8. By all reports I've seem, using higher capacity cells doesn't work well at all because the Duo won't charge them fully, hence undercharging memory effects for more bad karma. The higher capacity BTI packs with the PIC controller board replacing the blue thingie in the diagram below (the two-wire EEPROM? ) will charge them fully, No undercharged memory effects for the higher capacity cells and more runtime for the Duo. The PIC controller board would make for a truly intelligent recharging system. Or maybe a bully breaking a less than intelligent charging system to its will?
  9. Makes sense, what's the rating of each cell? That baseline x10 has to be over 12V and maybe a just a bit under 15V given a little inefficiency? Can't believe I missed your thread over the summer, nice work. But that's way beyond the scope of what I can do. You've inspired me to pull out the toolbox casing the hack from what's now been eight years ago! I'll start hunting down the rest of the parts and maybe have another go at that BTI high capacity NiMH setup vs. OEM NiMH setup testing project when I get a chance. Have you any notions about what the BTI PIC controller board might do
  10. I don't recall those methods, very interesting. I recall a utility that would run batteries fully down to zero state. But that might have been for NiCad packs? Do NiMH cells suffer from memory effect? There is a reconditioning charger for the Duo bats that work such miracles. Couldn't recall the name/maker, but I have one somewhere hereabouts. Found it in the other thread: VST Conditioning Charger I have a pack open right next to me. There doesn’t seem to be any intelligent parts other than what looks like two thermistors that connect to their own contacts on the
  11. Memory unit's FUBAR ATM, is the duo bat 12V or 24V? If the former, you're gonna need to do quite a bit of hackage. If the latter, maybe not quite so much?
  12. You and I both lack that kind of expertise. However, I'd check the old thread to see if the locations of the Duo bat's charging bits fit between those very handy barrel connector wires! If not, and external charger could work out?
  13. IIRC, KBD should be the same as a 5300 KBD?
  14. Tabs require spot welding, soldering is a no-no. If using higher capacity cells than those in the Duo packs, they won't charge any more fully than the originals, yielding the same performance. It's the little electronic bits inside the packs limiting charging level. The electronics in the High Capacity BTI Packs are made for fully charging cells up to higher limits inside the Duos. If you want to forgo in-Duo charging, you can use about anything that gives you the required voltage on the output tabs. Remove the charging Tabs or installing diodes so power flows only into the Duo, bu
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