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@techknight How about ECU repair? There isn't much coding experience required, it's mostly EE (diagnosis, repair, firmware flashing, reverse engineering and actual engineering of new boards) plus you don't even have to work on actual cars. The demand for someone capable to do this will only...

It's an AT PSU, not an ATX one. Specs-wise it's fine but you need to get an adapter and you'll probably lose Softpower. I don't remember how the AT power switch is wired up, but it probably doesn't use ground.  http://www.synack.net/~bbraun/macsrc/Quadra-900-mod.rom I can't find the page that...

Good to hear you fixed the squeaking noise and that it was just bad RAM. If you can live with spinning rust, then you're all sorted for now.  The next project will involve building a fake PRAM battery and a support that can be fixed to the outer casing using the security slot. If I could get my...

Well I'm both happy and sorry for you! The key (being a car guy), the speed (being my first 040) and the expandability is what drew me to the 950. But it's plagued with reliability problems. Hopefully an ATX PSU will solve most of them. It also can suffer from Maxell explosions, being...

2000th post! Now I need to get a Radius Accelerator 16/25 in order to fit in this new 020 group! Before I write another 2000 and get the 040 status, let's take care and finish this Quadra project. The boards are done. Unless someone makes another suggestion... Changes since last post: new...

Oh hi there. Did someone mention ATX and Quadras?  :) When I first saw this topic I immediately started suspecting the PSU. The Delta units in Q900-950/WGS95-9150s have technically two separate 12V rails. Since there's only one pin on the logicboard for 12V, I'd suspect the other one is for...

Wait, I thought you couldn’t swap orange flex cables with normal ones? Does that mean one could theoretically repair M5126 Backlit Portable display cables this way? Kudos BTW! At least it’ll be sturdier than the original. 

Hopefully that'll fix your issue. But at the very least you'll have a 32 bit clean ROM and you won't have to use mode 32, which can be buggy sometimes (and annoying if you don't have a PRAM battery). Also, you must delete mode32 after you install the new ROM.  

Back when I was using this card, my SE/30 only had 8MB of RAM. When I upgraded to 32MB I also changed the ROM and removed the greyscale Pivot. I am currently on the lookout for the color SE/30 version.  Here's the ROM SIMM I...

Real bad unfortunately. The RTC chip is completely corroded. Even if you fix all the traces to the ROM SIMM, all VIAs, all the chips, you'll never be able to start up from a SCSI disk again until you get a new RTC chip (and for the time being you need to get one from a donor board, so it's not...

Can't really try because I don't have any working old Macs around but I remember them working fine on my SE/30 (Powercache + IIsi ROM).  Have you tried making a copy of a working .dsk (maybe of one that is included with the floppy EMU SD card?) and initializing it with vMac? I've had issues...

I was finally able to make my code work on the ATtiny. Turns out it's really picky about pin names... and that PB2 (pin 7) somehow corresponds to A2 and not A1 as it should!!! Latest microcode: // QuadrATX fan speed controller // // The Apple Chronicles // // v0.4...

Endurance test is still going... Currently simulating a hot thermistor (LED is on). And the MOSFET stays cool to the touch so that's nice... no heatsinks needed. Please note that the piece of kitchen towel is there to dampen the PWM vibrations. The glass table is definitely not helping. I...

I have finished the calibration part and have updated the code and the schematic. I'd like to let it run today for an hour or so to check if the MOSFET heats up. It shouldn't but better be safe than sorry.  Next step, real hardware testing with the ATTiny85. 

Just realized while performing a quick verify/compile that I forgot a couple of semicolons... I remember back when I was a freshman at university, our coding teacher used to subtract one point from our grade (out of a max. of twenty) per missing semicolon. Ah those were the days... Also...

Hi all Small update... I have received most of the parts I need to test the fan controller circuitry. Unfortunately the ones I don't have (the MOSFET and the pots) are pretty critical and I can't calibrate my controller until I get hold of them.  But at least I got the "programmer" ready...

I don't mean to sound rude but wouldn't this conversation be more appropriate in a PM?  In other news, I've decided to use an ATTiny85 instead of the Nano. The boards will come with a preprogrammed chip and I'll offer programming services after the original run of boards is sold out (if there...

Great to hear @Ton but given that the engineer I talked to before deciding to do this mod repairs PSUs for a living and tests them at full load for 24 hours before calling them fixed, I wouldn't declare victory just yet... My recapped PSU died during a small stress/smoke test. My plan was to...

Good to know. So that’s probably why mine won’t start anymore. I know I should have recapped it by now but that’s just one of the many issues it currently has. 

The real hard work would have been trying to fix these old beasts, not gutting them... but at least, like Geekdot said, it’ll run cooler, be more reliable and easily repairable in the future...