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Bummer. Since you have it in a PC, you might be able to boot into DOS and use R6XMEMID to narrow down which DRAM channel(s)/bit(s) are having errors. I'm not sure what the mapping of channels to physical chips is on these cards, but there's a Radeon 9200 schematic posted at VOGONS and the 9000...

Nice work! The switch thing is also mentioned at The Mac Elite. My PC Radeon 9000 Pro card might be a bit of an oddball. Here's its switch footprint under magnification: As you can see, the top pads do not connect to anything! Even if one of those dual switches was populated, the top switch...

Awesome find! That looks like an early board with a socketed CPU; those are the best ones IMO. I agree on the logic board recapping. I am not a stickler for preventative recapping but the SE/30 is an exception. All SE/30 logic boards need to be recapped immediately. There will be electrolyte...

Thank you for all of this valuable information! I have some Mach 5 CPU cards on the way to play with. I already have a Scirocco card (from 8500/180) and a Helmwind card (from 9600/233) on hand. Do you have any advice for removing the heat spreaders on the IBM 604e3s?

Another push and twist practitioner here, for what it's worth.

Thanks! Now I have a reason to be optimistic. I will post my results when I get around to playing with them.

@stynx I recently found a decent deal on a pair of the same IBM dual CPU cards with 350MHz 604ev chips, so I bought them to play around with: Do you remember whether the CPUs you got from these cards were version 10,1 or 9,31? I hope mine are 9,31 so I can use them on Kansas CPU cards with a...

Pop open the door and take a picture, lots of experienced people here will be able to tell you what if anything is missing.

The aluminum polymer caps recommended by finkmac above are nice because they are sized correctly for the pads on the logic board. No risk of shorting nearby traces due to solder mask damage like there is with tantalums.

Early ADC G4s supplied 28V, but the later ones (like Quicksilver and MDD) were 25V.

Not a proper LCR, just a Chinese cheapo. No indication what frequency it's testing at.

Isopropyl alcohol is not a great solvent for the corrosion on these boards, and soaking it overnight would just be a waste of time. My method is to remove all the SMT electrolytic capacitors first, scrape any visible green corrosion from chip legs with a dental pick, then submerge the board in...

Love to see you're still having fun with this (even though I'm sure some of it has been Type II), all built upon the mighty Bombat platform 🙂

@jmacz and @s_pupp, that makes sense. Did you measure the capacitance of any of the parts you removed? One thing I've observed and recently begun to understand is that old capacitors that have no visible signs of failure will sometimes read significantly higher capacitance on a simple LCR meter...

@trag A modified 7100 ROM DIMM has been used to boot an ANS: https://68kmla.org/bb/threads/mac-os-on-ans-modding-a-rom-dimm.51120/

My experience matches Phipli's, although I think I had a leaky 6100 years ago, and that's a 1994 machine. My 5400, 7600, G3s and G4s are all fine.

@Unknown_K Would you be willing to check whether any of them have the hynix -33 RAM? I haven't been able to figure out the timing issue with mine, and it's still bugging me. I think I have backups of all the ROMs from The Mac Elite, but if anyone else wants to try archiving it, the more the...

Or modern 1.2mm thick SIMMs, which seat badly.

I'm not sure whether the X800XL could be flashed. As far as I know, the only official Mac AGP X800/X850 cards are native AGP (R420 core). The X800XL uses a different core (R430) without AGP support, with a PCIe-to-AGP bridge chip. I've been buying and flashing AGP video cards for G4s for a...

Does the dual-link DVI port work with a lower-resolution monitor in single-link mode? Unfortunately my Mac collection stops at G4, and I don't have any large monitors at home, so I don't have any experience with dual-link DVI beyond reading about people having problems with it. Seems to be...