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Okay, so you are not constrained to a single SCSI ID. 4 x 4GB images seems like it would be the most practical solution then.

Thank you for the advice. I will be much more patient when removing and reinstalling the working chip, maybe even enlisting the kitchen oven to give the whole board a thorough heat-soak/drying beforehand :) I don't want to make any popcorn!

Doesn't GBSCSI just run ZuluSCSI firmware?

Thanks. Yes, I just have the most basic 853A preheater: Of course, it is far too small for the whole logic board, but I did let it warm the board around the KeyLargo chip before removal. I was impatient though, so the board was only 55C (measured from the top with IR gun) before I decided it...

Well, absent any specific advice, I did some reading and watched some YouTube videos. I think I've settled on using balls and flux over solder paste. Step 1 of this process is making sure I am able to remove the bad part without damaging the board, so I did that: The pads are 0.635mm diameter...

What are the specs of your G4 @Coloruser ? There was a benchmark thread a while back, @GorfTheChosen saw about the same performance on a dual 450: https://68kmla.org/bb/index.php?threads/lets-see-your-best-disk-speeds-ppc-68k.49268/page-3#post-554678 In the first post of that thread...

Neat! It's such a bummer that OS X can't take advantage of multiple 604s.

I thought I got a good deal on a Quicksilver logic board on eBay, but it was DOA. Upon further inspection, I spotted these gouges in the substrate of what I believe is the KeyLargo chip, the smaller BGA on the back side of the board, near the PCI slots. The damage is in the lower right corner...

Ah, from 2007! Well, 18 years later, I have confirmed it 🙂

It's too bad that OP will probably never see it without an email notification, but I figured this out yesterday. I found this thread while searching for info, so I'll post my results here. I have two Quicksilver CPU cards, an 820-1344-A (7455, 933MHz) and an 820-1282-A (7450, 733MHz). I, too...

Yep, the large partition was the problem. Boots OS 9 just great off a smaller device or <200GB partition on the 500GB drive.

I've used that before. It's good, but it has some limitations; it's basically just green paint, so flux remover will take it right back off. Make sure you have all your cleaning done before applying it.

I have nothing to add other than to say thank you for maintaining this great resource of information!

I would give Disk First Aid 7.2.2 a shot at repairing the image. I believe that version even works in Basilisk II.

No, I have never been able to boot OS 9 via the 1210SA, before or after the swap, so it's unrelated. I think the problem may be the size of the drive. I found this: here: https://web.archive.org/web/20080508023708/http://docs.info.apple.com:80/article.html?artnum=86178 Most of that article is...

AP7361C-33ER-13 installed, Quicksilver is now now sleeping (and most importantly, waking) like a champ with the flashed 1210SA! Weirdly, it won't boot OS 9, but it boots Tiger just fine; In fact, I'm typing this on it now :) Good luck with yours!

Typically a privacy cover, so the screen is only visible from directly in front of the computer.