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I had the presence of mind to take a picture of the XRack board after removing the flash chip, before installing a PLCC socket. ID3:2 are floating, and ID1:0 are connected to something. I will poke around a little more and compare to the PC card when I have a chance.

Here's how a working card shows up in OF: Note the difference from this post. cc97 and aa01 seem to get into subsystem-vendor-id and subsystem-id from the AT93C46 somehow, and this seems to be important to the card actually working.

I was able to make some progress on this thanks to @opualuan generously loaning me his XRack card. I dumped the ROM and attached it to this post. It's only superficially different from the Mathey ROM; just the names are changed, everything else is the same. The contents of the AT93C46 are...

It's almost certainly ADB, since ADB trackpads continued to be used all the way through the G4 models.

Very cool!

Hi @Ivan Holmes, I think I actually have what you need! I bought a 500MHz TiBook logic board on eBay a while ago to harvest its Uni-North and KeyLargo chips. I also removed the CPU and cache chips, but I don't need them. I can't guarantee that the parts will be functional since I bought the...

Haha, I wrote that page a long time ago :D The information there is correct, but not comprehensive. There's a Digital Audio schematic on MacDat, but I have never seen a MDD schematic, so I do not know if there is a difference.

Yep, that's my understanding also. I'm not aware of a difference in Apple's implementation between Quicksilver and MDD G4s, though, but perhaps there is one that explains why this card is not backwards compatible.

Ooh, yeah, cool card. I wonder why these don't work in pre-MDD G4s. I know Apple did some screwy stuff with the AGP slot to cram the ADC features in there, but I thought that was common across all post-Sawtooth G4s. Yeah, I've heard the stock heatsink/fan on the 9800 described as more...

That shielding is zinc-plated, isn't it? Seems like you'd need to re-plate it to fully restore it.

I hit a wall on this and set it aside for a while. I flashed a 93C46 with the data from finkmac and wired it up according to the VT6421 datasheet. I tried it in both 16-bit and 8-bit mode (ORG pin pulled up and down) and nothing changed about how the card shows up and works in the system vs...

And from J12, you still have the voltage drop across the logic board, riser board, and two sets of DIN 41612 connectors. Might as well just solder a 4-pin Mate-n-Lok pigtail to the Turbo040 and connect it straight to the HDD power :)

Neat find! Thanks for documenting this.

Cheers! You did most of the work with your already extensive troubleshooting, I just put together the pieces you provided :)

That is indeed UH7. Looks like you shorted pins 7 and 8, which are the DRAM CAS and the output of the Y2 oscillator, respectively. Probably didn't hurt anything, and should be unrelated to the CRT issue.

That's odd. The only way I could see that happening is if there was a short here:

I would hang onto it; it might be fine. I was pretty lazy and didn't scrape off much of the battery residue. Just don't mix it back into a larger container. I'm actually interested to hear whether a similar reaction happens in your case.

Careful with battery-bombed parts in Evapo-Rust. I soaked a Maxell-bombed SE/30 chassis in mine and it seems like something from the battery juice contaminated the Evapo-Rust. A very unsavory chemical reaction occurred; the solution turned dark and smelled awful. I had to toss the whole 3.5...