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Ta-dah! We fixed it! In a very rare occurrence for these kind of threads, the original poster doesn’t just disappear but comes back with a fix, for everyone else to enjoy - even if we didn’t get any help even after asking repeatedly ;) So it turns out that the issue was with the two bleeder...

Bump, I have since determined that TRKL raises to 5V with discharged caps (which allows me to turn it on if I press power very quickly) but that it quickly drains to 0V and stays like that after a few seconds. From reading around on https://www.loneadmin.com/iicipower.php It seems the fault...

Hi everyone, just got hold of a wonderful Quadra 650 in great shape. I am having some issues powering it on, though. After receiving it and cleaning it up, I turned it on, saw that everything worked and went to bed. Next morning it wouldn’t turn on anymore. Skimmed over some stuff about the 5V...

Ah, so you did the same thing as I did and put a Yikes G4 in your G3 Beige - sorry didn’t read it correctly the first time. I didn’t actually check if caches were enabled while I was playing with it some months ago, I will give it a look next time I power it on. Thanks for the tip!

Did you try with a 7400 or a 7410? 7410s will get their cache controller fried when used on a G3 ZIF, as explained by LightBulbFan. I just purchased a broken (and with missing parts) G4 Yikes for peanuts and put the G4 in my G3 Beige - overclocked it to 450MHz (IIRC) after placing a fan in the...

It is indeed possible if you route some traces to another voltage source - the aftermarket G4 ZIF must be doing that. The 7410s has dedicated pins to L2OVdd. Anyway I don’t think I will experiment with a 7410 anytime soon - as I have purchased a G4 Yikes for a very decent price. I will just get...

Thank you very much for commenting on this issue. I guess you mean that it will kill the L2 controller inside the 7410, right? Sadly I guess it doesn’t make too much sense to do all this effort and not to have a functioning L2 cache as it would hamper performance massively. Well, back to...

Hi everyone, Since I couldn’t find a 350+ MHz G4 for cheap for my Beige G3, I decided to make my own. I own all kinds of soldering supplies and I have some BGA soldering experience. Bought a 300MHz G3 (comes with 1MB L2 cache able to run at 2.8V) and 5x MPC7410 450Mhz. From what I gather...