Recent content by obsolete

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...