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By the way, from my recollection, IIfx will not give you a sad chime if the RAM is missing or “undetected” but it generally chimes for bad RAM. It sometimes takes a very long time, like up to a minute after happy chime.

I experienced the same thing with my 16MB “Doug Brown SIMMs”. I added solder to the pads, same as you did, and now they snap in nice and tight and work flawlessly. The key is to tin them all to the same thickness which is more tricky than it might seem. I use Kapton tape on the back side to...

That should be fine for the most part. There are some boards that are designed to make electrical contact with the RF shield, in which case you should just make sure those contact points are not coated with non-conductive material. Edit: To clarify further, I’m referring to boards like the...

The RF shielding is always nickel or zinc plated steel, with the plating layer providing corrosion resistance. Acids from exploded batteries or other sources dissolve the protective plating and corrode the steel underneath. If you remove the corrosion, you’re still left with exposed steel...

IMHO pretty much all the 030/040 accelerators from that era are really good. I have a bunch of cards from various manufacturers (e.g. Daystar, Micromac, Applied Engineering, Novy Systems, etc) and never had any issues with any of them. But the Daystars probably have the widest compatibility...

Personally I would just solder the IC down and then run a wire from the via to the leg. Before all that, I would clean up the pads and scrape the traces to ensure you have continuity (pad 2 trace looks broken, for example). Lifted pads don’t matter as long as you have a few good pads to hold...

Excessive heat is a failure point for all electronics. But you can definitely reach current limits of the Cube's built-in VRM before heat becomes an issue, especially if you use cooler-running hardware or have a good cooling solution.

Standard 9.2.2 will not work on a 6500. You need the OldWorld version: https://www.macintoshrepository.org/52635-mac-os-9-2-2-for-pre-g3-power-macintoshes As for rescuing your disk, I would just boot from an 8.6 or 9.1 CD, delete the system folder, and start a new installation. Also, zapping...

Just wanted to share my solution. I ended up using the Sonnet ATA card with Startech SSD adapter and a generic Kingston SSD. I knew this would work since the same solution works in the 5500's contemporaries, but I didn't have a solution for placement. Until today! I decided to just mount it...

Agreed. The IIx appears to be the rarest of the three. I suspect the reason is that when it was released, most people, businesses, and universities already bought the Mac II and weren’t ready to put down that kind of money for a relatively minor upgrade. The IIfx was a different story. The...

Hmm did you try zapping your PRAM?

I have one of those and it never caused a crash. Are you sure it's crashing? If I remember correctly, the Sonnet pauses for a bit (like 30+ seconds), while switching to the cache card CPU.

There’s just much more of them out there for sale than the IIx and IIfx. They are quite common on eBay, and many of them are still in working condition, especially the earlier models without surface-mount electrolytics. The OG Mac II is a great machine to own. The only downside IMHO is the...

No difference whatsoever. That’s the first thing I tried.

You might be onto something here. I checked my cards again today, and the two "good" cards are using a different RAMDAC than the "bad" card. The bad one is marked “9026”, while both the good cards are using “9047”. Maybe others can check their revisions to confirm if this could indeed be the...

Hmm I’ll try the “faulty” card again in the next few days. But I’m pretty sure I had the control panel installed (the one that launches a yellow rocket during boot?) and it persisted to desktop. The “good” cards never had this issue, even before extensions are loaded. This was on 7.1.2.

Hmm I have 3 of these and only one of them has this issue. All of them are the same exact Rev A ROM (341-0812). Also, mine has the lines repeating in a different pattern than both your and the OP pictures (see my thread linked in the second post). Lastly, the issue does persist in higher...

I posted a similar thread recently. https://68kmla.org/bb/index.php?threads/apple-8-24-gc-artifacts.50006/ I believe the culprit is probably a bad VRAM ic (one of the 16 ICs in the middle of the board). I have several of these cards, so I never felt compelled to troubleshoot the issue. I...

Some of the custom ROM SIMMs use thinner PCBs and therefore don't fit correctly into the slots. However, I've never had one come loose. Is your problem caused by the metal latches not firmly gripping the SIMM?

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