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  1. Jaek_3

    L2 G3 Sonnet Crescendo / ATI RAGE128 compatibility issue?

    Hello everyone, I had some time today to work on my Takky. I’ve fully reassembled it and everything’s working as it should. The CC is totally stable until it’s placed under heavy load. Even with a PCI ATI card installed, I only get crashes trying to run complex 3D games...
  2. Jaek_3

    L2 G3 Sonnet Crescendo / ATI RAGE128 compatibility issue?

    The PSU and the analog board are combined in the CC and neither of them was connected. I plugged power straight into the logic board.
  3. Jaek_3

    L2 G3 Sonnet Crescendo / ATI RAGE128 compatibility issue?

    Unfortunately I've already tried it. It should still work though, right? I don't see how anything could have been damaged.
  4. Jaek_3

    L2 G3 Sonnet Crescendo / ATI RAGE128 compatibility issue?

    Hello everyone, quick update: I hooked up an external PSU to just the logic board on a bench completely disconnected from the stock analog board and PSU. The CPU fan and HDD started spinning, but no video from the ATI card and no chime (from external speakers). Nothing blew up. I've double...
  5. Jaek_3

    L2 G3 Sonnet Crescendo / ATI RAGE128 compatibility issue?

    Thank you for your response, Byrd. I do already point a desk fan at the internals of my CC, but that brings up another point: one of these days I'd like to install a fan of some kind inside my CC in addition to the PSU fan already present to help cool the fully decked logic board. Does anyone...
  6. Jaek_3

    L2 G3 Sonnet Crescendo / ATI RAGE128 compatibility issue?

    Yes, the new PSU is mounted directly to the metal shield of the old one via some metal stalks. I can common the grounds between an ATX PSU and this one just with an alligator clip, right? Is there an optimal place to source the ground on the ATX PSU or can I just get it from a ground pin? As...
  7. Jaek_3

    L2 G3 Sonnet Crescendo / ATI RAGE128 compatibility issue?

    I'd like to verify the 3.3v situation; would it be possible to temporarily hook up a desktop ATX power supply to just the logic board, leaving only the CRT powered by the stock PSU? I'd turn the ATX power supply on, then the stock one inside the CC, and then pressing the power button on the...
  8. Jaek_3

    L2 G3 Sonnet Crescendo / ATI RAGE128 compatibility issue?

    In addition to the stock PSU my CC also has a Mean Well EPS-45-5 installed (40W, 5V, 8A). Is that not sufficient? I've noticed that when the logic board is fully populated with a G3 card, max RAM, an ethernet card and a GPU, the CRT seems to sort of struggle to turn on. It takes like 10-15...
  9. Jaek_3

    L2 G3 Sonnet Crescendo / ATI RAGE128 compatibility issue?

    That would explain why the Sonnet card doesn't ever crash the computer, but the ATI card always does under load. I was wondering if anyone could link a better/more suitable 3.3v regulator for me to replace the current one with? I'm not good with electronics...
  10. Jaek_3

    L2 G3 Sonnet Crescendo / ATI RAGE128 compatibility issue?

    What would make my regulator weak? I'm using a TSR 1-2433 regulator from Traco Power. I just tested the output with my multimeter and I get 3.2v.
  11. Jaek_3

    L2 G3 Sonnet Crescendo / ATI RAGE128 compatibility issue?

    By the way, I also have a MAXpowr that crashes the machine within minutes even idle. I bring it up because the crash looks identical to when my ATI card crashes in an intense game. At first I thought the MAXpowr card was defective, but now I'm thinking these might be related phenomena.
  12. Jaek_3

    L2 G3 Sonnet Crescendo / ATI RAGE128 compatibility issue?

    Ok, I've measured power on the 5v and 12v lines with my multimeter and got a constant 4.9 and 11.8v respectively, which I think should be alright? What exactly is the purpose of the 3.3v line? I actually had to install a 3.3v regulator from the 5v line to supply 3.3v to the logic board, because...
  13. Jaek_3

    L2 G3 Sonnet Crescendo / ATI RAGE128 compatibility issue?

    There are actually two PSUs in the machine, per this mod: https://powercc.org/psu/. The new one outputs just 5v. I do suspect a power issue because there's always a very slight distortion in the monitor display that gets worse the more stuff is added. It was a lot worse before the extra PSU was...
  14. Jaek_3

    L2 G3 Sonnet Crescendo / ATI RAGE128 compatibility issue?

    Update, the computer just crashed again running Quake RAVE with the Sonnet card removed... so I guess that confirms the issue lies with the ATI card? I do wonder, though, since I am running this all on a highly modified "Takky" Color Classic, if there's some other cause for the incompatibility...
  15. Jaek_3

    L2 G3 Sonnet Crescendo / ATI RAGE128 compatibility issue?

    I've confirmed Sonnet driver version 2.3.1 is installed. I have confirmed that both work in isolation, it´s only when I pair them together that problems arise. The ATI card is just a bare PCB. It (and the Sonnet card) do get extremely hot, but no crash unless they´re paired together...
  16. Jaek_3

    L2 G3 Sonnet Crescendo / ATI RAGE128 compatibility issue?

    Hello everyone, I have a 400mhz 512k Sonnet Crescendo L2 G3 card that normally works fine, but whenever I use it in tandem with an ATI Rage 128 card in a demanding 3D game the computer (internally a Power Macintosh 5500, in a Color Classic case) locks up in under a minute. I was wondering if...
  17. Jaek_3

    Takky Color Classic - bypass the internal video chip?

    Hi everyone.  About a year ago I made a post asking about installing a new power supply into my Takky'd CC... I got the parts in the mail shortly thereafter but I decided to put the project on hold because by that point I had been at it for over a month and needed a break. Well the other...
  18. Jaek_3

    Color Classic hardware buttons

    Check the ribbon cable connecting the button board to the harness with a multimeter on continuity mode. If that checks out, replace the caps on the logic board?
  19. Jaek_3

    Takky power supply mod. Help please!

    Yeah, I really just wanted to see it done haha. Currently I've got a kitchen fan parked right behind the CC blasting it at the max setting, that's worked out good so far. What I've really been having trouble with is getting games to run, they really don't like the dual monitor setup but I can't...
  20. Jaek_3

    Takky power supply mod. Help please!

    So after three days of internet scouring, I was finally able to locate the Mac Voodoo5 bios rom I needed to flash my Mac Voodoo5 from the PC firmware I installed on it a few years ago back to the original, and now it works just fine! Unfortunately I think the 225 mhz CPU bottlenecks the...
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