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Speaker polarity is irrelevant to functionality. If it makes you feel better, connect the red wire to '+' on the speaker.

I think the real answer is a standard PCB size (i.e. too small for proper fit in the vintage sockets) with a shim soldered to one side.

Absolutely. Something just plain gets out of tolerance. In my case the socket looks slightly bowed in the horizontal plain. The DDB SIMM is rigid enough to pull it into alignment. The BMOW SIMM flexes with it.

+1 on Eric Woo. I've bought a handful of CPUs from him and every one was gen-u-ine.

There's nothing magic about the metal clip sockets. I have an SE/30 that simply will not work reliably with a BMOW Rom SIMM, even after bending the clips in a bit. That helped, but it still crashed intermittently. I tried building up the contacts with solder. Again it helped a bit but not...

Absolutely it's possible. I'm running an LCIII in that manner (ZuluSCSI rather than Blue, but Asante SC interface works the same way).

Thanks for the clarification. But, on the bright side, I've run into a fair number of PALs with intact security fuses. One can always hope.

Has anyone thrown the PLD against a DuPAL?

+1 on a vinegar soak! I was able to restore a horribly battery-bombed Lisa 2/5 by starting with a 2-day soak of the back plane. Connectors were fuzzy green on the way in, but bright and shiny on the way out.

The Mouser part is an 84-pin PLCC socket and thus should be the correct replacement part. It's incredibly easy to yank out via barrels when attempting to desolder the old part as a unit. If I were you I'd consider crushing the old socket with pliers to the point where you can pull the pins...

Doesn't one of the 68k Mac diagnostic suites check PRAM? I know I've seen it recently, but cannot recall which application I was running.

You've piqued my curiousity! When my bench is clear I'll see what I can dial in with the RGB-HDMI 300A. It should be able to do better than that.

In my experience, the RGB-HDMI 300A will sync to just about anything with enough twiddling. Absolutely the best bargain in vintage computer scan converters (I have 5 of them). FYI: The built-in preset save/restore is only for output resolution. You need an attached PC running their control...

Thanks! Might want a couple of photos on your Ko-fi page.

FIXED: Problem was a rotted -5V contact on the power supply molex plug. Looked fine from the outside and measured continuity when a test lead was stuck in... Simple, but ran me around in circles for a bit.

I think I need a bit of help in troubleshooting my LC475. I'm scratching my head a bit over the schematic on page 13. A scope on pins 18 (or 19) of the DFAC chip shows that PWM is being generated when I trigger a notification. It reads a steady square wave under quiet conditions that then...

This should work: https://www.ebay.com/itm/296681016042

Rats. I'll have to put on the thinking cap and fabricate something.

I just ran into the same issue. An extra-tall IBM 128M simm leans way over the CPU and prevents installation of a heat sink. There are a couple of vendors who offer a standard-height 128M part at reasonable prices (~ 30-40 USD) and I'll probably go in that direction.

I believe it's a metric thread. Try Fastenal or McMaster-Carr.