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Weird.. if I power the -12V line ahead of time before the main PSU kicks in, the speaker pop volume drops to match the stock PSU. Doesn't change the behavior of that LED on the ROM SIMM however. Must be a timing thing. Need to check for any delays on the three rails for each PSU with a scope...

I borrowed a Quadra 950 stock power supply from @techstep. With that stock unit, there's still a pop but it's much lower in volume compared to what I hear with the ATX converted power supply. Voltages on the stock unit: ~5.1V/~12.3V/~-12.1V. Voltages on the ATX unit: ~5.05V/~12.1V/~-12.3V. Seems...

I was watching a video of a Quadra 950 boot and it doesn't have the loud speaker pop on boot. So not sure what's going on. Need to disassemble it and debug as it's just bothering me at this point :) I believe @Bolle mentioned the units he had were doing the same thing so there must be something...

Indeed I did. Found a PSU putting out 30A on 5V so went with a conversion and it works great. My stock PSU had power on the primary side but was completely dead on the secondary side. I think the transformer died. Rather than debugging, I saw a Corsair HX1200 for sale used at $50US so I went...

FWIW, my IIfx freezes with RocketWare with 32bit addressing enabled… but that was with 128MB of memory. Others on this forum had the same freeze with 32bit enabled, but it worked when they took it down to 20MB of memory. RocketShare works fine with 32bit addressing and with a ton of memory...

Quadra 950 is done... that static pop immediately on power on (before chime) is annoying, wish there was something to be done about it. Feels like some unexpected noise going to the speaker on power on before everything has stabilized. Maybe needs something to keep the speaker down until a split...

It most likely broke off the plastic in the display. You can take it apart, clean it up, 3d print new hinge mounts (many models on thingiverse and I also have a model in the link in my signature), and then mount the hinges. If it broke due to the magnesium chassis cracking, you can try epoxying...

Spoke with Bolle and he mentioned the quadra 950s he worked on all seem to have this pop from the speaker before chime. So it sounds like a common issue. In that case, I'm not going to worry about this now.

I picked up @nickpunt's monitor today and confirmed the same results as he saw. Connected it to an 8*24 card which is known to support the portrait display and still I'm unable to get proper sync. A standard cable for the portrait display doesn't require an adapter. But the fact that this...

When I get some time, I will.

I did finally get my hands on a Radius PrecisionColor Pro 24 XK. It came with ROM version 2.0. Took me a while to get a driver that worked. RadiusWare 2.2.1, 2.2.2, 2.3.2 all didn't recognize the card. Finally got something that worked by downloading RadiusWare 3.4.1 from Macintosh Garden...

Finished the Quadra 950 ATX converted power supply. As I mentioned before, it's using a Corsair HX1200 which is a PSU from 2016-2020 that is no longer sold but you can find them used and in good condition. It has independent regulation of the voltage rails, and provides 30A on 5V. It's an...

Thanks!

Same as usual. Rustoleum Satin Stone Gray. It's a little dark and a little cool in tone compared to the original platinum, but that usually shows mostly when it's dark. In daylight, it looks close.

That Corsair HX1200 PSU is working well. Strong solid 5V/12V/-12V at the logic board. Power on circuit is working and the relay to the passthrough power connector also is working great. Q950 boots, chimes, sound works, all looks well. Only issue however is that on a cold boot, before the chime...

Sharing some pictures of the plastic repairs on my Quadra 840AV. Used plastic weld to fill in the broken areas, then cut away the excess, sanded it down, and then painted.

👍

Yes, I think you guys are right. I must have thought the slider was representative of the amount of memory detected but it wasn’t. But I got the same cpu errors and never got it to work.

I was thinking there could be some additional code paths for different hardware but I didn't notice any while debugging - although I was heavily focused on the particular one that performed the NVRAM writes that @joevt found so I could have missed it. But if you're saying that toggling the...

That’s what I resigned myself to when I had a TW1340 and I saw the same Apple Fritter post. But mine did show the 16MB to compact virtual, it just wouldn’t let me use it and allocate it as a RAM disk. It complained about the lack of a 68030 even though it was accelerating so in my case a full...