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About Compgeke

  • Birthday 01/06/1997

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    Fairfield, California

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  1. Compgeke

    ADB to Macintosh Plus Keyboard cable mod?

    Nope. Completely different electronically.
  2. Compgeke

    Recent spike in PPC Mac prices?

    Something worth noting is ebay won't show an actual selling price for an offer. Having recently helped someone sell a bunch of PowerBooks, they really aren't worth much money. Full selling list: Wallstreet/233 / 96M / CD / No HD - $32.50 Wallstreet/250 / 160M / 4G HDD / Two Batteries - $25 15" G4/1.5 / 1G / 160G / Airport Extreme - $40 12" G4/1 / 512M / AirPort / Combo Drive / No HD - $23 Pismo/400 / 512M / 40G / DVD-ROM - $56 12" G4/867 / 640M / 40G - $25 Walltreet/233 (+L2) / 192M / CD-ROM / no HD - $30 12" G4/1 / 768M / 60G HD - $20.50 Lomboard/333 / 512M / DVD-ROM / No HD - $40 Some of these sat for almost 2 months with sub-$40 BIN prices. There are always some outliers on ebay, but it's the exception and not the norm. A really nice TiBook will sell in the $100-$200 range, but the majority of other machines aren't worth much. About the only ones with value are a Wallstreet with the DVD decoder card, a Pismo/500, high res 2005 Powerbook G4 and Clamshell G3s. Everything else is sub-$50 for the majority of cases, even in the best shape. Exceptions included for ones with SSD mods, new batteries, etc, etc. Those're going to run you more money on ebay - but those aren't nearly as common as Billy finding his old laptop and tossing it up.
  3. Compgeke

    Supermac Spectrum 24PDQ

    To be clear, it's the original 24 PDQ and not the 8-24 PDQ, correct? I've got an /24 PDQ with the 1.24 ROM but I'll need to dump it at a friend's house. My programmer decided to stop working.
  4. Compgeke

    BGE's take on the Quadra 900/950 ATX PSU Mod

    More or less just something like this: Ignore that center track, it's an image I stole from the internet. Coil power would be on the left and coming in and the mains switching on the right. Keep traces and planes away from the mains side area that aren't needed - such as running anything DC over there. Red would be a couple slots to prevent arcing if something went wrong. Could do without them, it just makes me feel better with them there. Can never be too safe.
  5. Compgeke

    BGE's take on the Quadra 900/950 ATX PSU Mod

    Feel free to use what you want from the attached file - I've got no plans to do anything with it. I just hacked up the mAcTX adapter board and adapted it for a Quadra 900 series. In theory all you'd need to do to make it work is have a PCB made and use a 22 to 22 pin cable. In practice no idea - I only have a Quadra 650. A 24 to 24 cable might also work providing the Q950 has no components for the two extra pins to foul on. For a relay board you're on your own. I left on a 2 pin connector - run a separate board for the relay. It's nice to try and keep mains off the primary board in case shit hits the fan. Include an anti tracking slot in between the AC pins. You want to minimize the path in case of an arc - and slots are great for stopping it. mAcTXc_3904_Q950.zip
  6. Compgeke

    IIci dead PSU?

    The electrolytic inside these absolutely do need replaced. They also leak out onto the board but don’t cause nearly as much damage. Easy fix though - they aren’t surface mount.
  7. Maybe it's been a while but we haven't have forgotten you! The PCB for the Macintosh IIc* is finished footprint wise, and I think we've got the components nailed down too. So, onwards with findings: 1.) ATX seems to not be ATX 100% of the time. By that I mean we've been thinking @blusnowkitty's IIsi had issues this whole time but that's not the case - it's my ATX PSU I was using. It seems some ATX PSUs are more forgiving to rapid on/off. The other one wouldn't reset right away so the system would shut down right. The new one wasn't happy that there wasn't an immediate drop in the ATX_ON signal and reset right away. The fix was to up the resistor for the /pfw line which now works perfectly. Even better is that change didn't break compatibility with the Quadra 650 - need to test IIcx and IIci later today. Here it is with those changes in the Quadra 650. Line is still high enough to not mess anything up - works fine! I've also done some load testing with the final version of the board! Full tilt 33 MHz '040, three 24-bit video cards and a spinning hard drive still keeps it above 5V on the board output - and that's with 1oz poverty copper.
  8. More update: For get the whole voltage thing for now as I've now got two IIsi s confirmed working. Got a 2nd recapped and it's all rainbows and sunshine. And here's a video of it working:
  9. Compgeke

    Recommended system extensions?

    That's just Mac OS being Mac OS. Anything prior to OS X does that really.
  10. I got the IIsi board today, got it recapped and got it working. Some fun discoveries though. To start with, the IIsi is possibly special. By that I mean it's /pfw voltage for button press seems to be a bit different. Lemme make a list. IIsi I have here: 3.4v @blusnowkitty 's IIsi: 4.4v IIci: 5.1v IIcx: 5.1v Q650: 5.1v. Notice a slight difference? I do. With the good news - the transistor board is working fine for me. As is the 74HCT04 and zero resistor setup. The bad news - why are the IIsi s giving different readings. Why is the one with the lower readings working and the higher not. I need to probe more IIsi for "wtf is going on" - see which is the anomaly. Good news is there's someone else close to me with a IIsi who also needs some help with another machine. I'll see if I can get a reading off theirs.
  11. Compgeke

    040 Recommendations?

    Quadra 650 for sure. The cases are pretty reasonable despite being ugly. They run at 33 MHz and are (usually) a full '040. There's no reason to pay the extra cost for something like an 840 for an extra 7 MHz. As a bonus only the power supplies need recapped - the motherboards are solid caps from the factory. 800 is the same machine but in a worse case. They're more prone to breaking.
  12. To expand a bit, the LC is a different thing all together. Physically this particular board won't fit within the LC PSU shell. The LC also doesn't require a /pfw inversion (they don't support soft power) and it uses -5V rather than -12V. We've talked about it and even have some plans however that's an "After this one" project.
  13. Of course, if you're working with other people I'd recommend using KiKad There's Eagle can be a bit special when exporting to work with other programs and break silkscreen text placement and those kind of goodies. That, and you'll lose all the device footprints and just get holes in general. Not really something heavily needed and the exclusion enables it to fit in a IIsi easier. The 10 pin connector has a fairly snug fit (and really, you could get away with no standoffs) so as a good measure one's thrown on the other side. I ran some traces through there on the last (that should be final - pending IIsi testing) revision to allow for a cleaner layout and more space for the 5V and ground planes. I Here's the board we have for testing at the moment (first version with planes). It does work (I can pull a fair amount of current) but I'd like better. Here's the current setup, the one that cut out that top standoff hole. A slight modification on the brown board gives significantly better area for the rails. And ground:
  14. A few days late, but the third version boards finally showed up. Built and working 100% no issues for me on my test systems, a IIci, IIcx and a Quadra 650. As some bonus fun, I can now load up the systems and stay (barely) within tolerance on the 5V rail using only poverty spec 1oz copper. +/- 5% (so 4.75 -> 5.25v) are generally considered acceptable ranges. On final boards they will be thicker than 1oz copper - we're just cutting a good $20/run off of testing boards by using the cheapest option. That's a 33 MHz full '040, a spinning hard drive and three 24 bit color cards. A PaintBoard Li, a Supermac Spectrum/24 PDQ and a Radius Precision Color Pro 24xk. Maybe tomorrow I'll dig up some more ram and see if I can up that draw to better match what you'd find inside a compact mac. Maybe a CD drive or something.
  15. So if we were to switch to a board using a transistor rather than the inverter (smart move really) here's something along the lines of what it'd come out like. With rearranging of the big stuff, I'm able to clear up even more space which adds even more free plane space between the power supply connectors. This means more current handling again. Any traces possible have been routed along the outside as well, rather than through the center splitting it up. Notable usability changes: I've moved the fan connectors over to the edge of the board closest to where a fan mounts in the case. During testing I'm getting tired of fighting with the connectors behind the power supply cable. I'd imagine you guys would feel the same. The LEDs are now a bit hidden when installed in the system. The good news is you'll still be able to see red or green reflecting off everything as long as we use a diffused LED. So, current handling fun: Here's the narrowest areas +5V has to pass through. I can run a IIci w/ nubus video card and spinning HDD off just one of those so this will hopefully be plenty. In theory ~75 mil * 4 with thinnest possible copper would net you ~10.5A current capability. Going to 2oz copper (the logical thing to do for a PSU board) would get you closer to the 18A mark. Ground has more area to pass through than +5V so that won't be an issue. Now, 10.5A is less than a factory IIci power supply however it's also more than a stock IIsi power supply. As far as something like +12V, it's a single 75 mil trace. With 1oz poverty copper that should be able to push 3.5A give or take. Good news is that is higher than a IIci's 2.5A or a IIsi's 0.8A on 12V.