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A Mean Well PD-25. It supplies 5v for the card and 12v for the fan.

I believe that side connector is for SCSI, but I have no documentation to that affect and I have never tried connecting anything to it. A lot (most) of these boards were powered by tapping into the Mac's analog board. Some connected directly to board with clips and some, like mine, tapped into...

Nice score! I have one I found in a $5 Plus I bought back in the late '90's. I made an over-long thread about mine.

I did an ATX swap in my MDD a couple of years ago. It's still working fine.

Wow, that is incredible. The crazy lengths people went to back in the day!

Ha ha ha! That floppy drive is messing with your mind! Ok, now swap them back and see if the problem returns... Just kidding, don't do that. No telling why the internal drive works externally, perhaps some anomalous electrical interaction between the drive and the internal vs external bus...

You can start/stop the drive with the Sony Test software.

Sorry, I meant removed the drive from the Mac and cleaned it etc. not the felt pad. It might be helpful to remove the drive and use it with your external case so you can watch the mechanism when it tries to read a disk.

The test launches with those three test windows open. Close all the test windows then select the drive and open one test at a time. There was still one or two tests that caused lockups even then. Also, I ditched everything from the Mac Garden image except the Sony Test application and am...

I can try your disk image. My 512K is an "e" model with the newer ROMs. However, I fiddled around with the sony test for quite a bit and I came to the conclusion that for whatever reason some of the tests just don't work. (Lacking documentation I don't even know what some of the tests do.) It...

I had no problems with the version from Mac garden. I used it with my HyperDrive 512K and my Plus with a SCSI2SD. However I ran the software from the drives, rather than a floppy. Some of the tests did not work for me either, causing a lock up requiring a reboot. I do not remember which...

Electronics are cleaned with ultra-pure DI (de-ionized) water. At the very least any board cleaning should done with distilled water.

You may find an accelerator card inside.

Great project. A good candidate for printing with decent results!

Not to my knowledge, but I don't know everything.  ;) Post some photos when you get them open!

Very nice save! :)

Nice! I have a 180-165 I built about 20 years ago. It still works!

I got a couple of these Exell Battery A21PX 4.5-Volt Alkaline Battery from Amazon a couple of years ago. I notice the price has increased since then.

Dropped by whom? Jobs killed the Newton at Apple in 1997. Moto introduced the Marco in early '95 and I would be surprised if they were actually sold for more than a year. The Marco runs Ver. 1.3 of the Newton OS and Moto made no effort to move beyond that.

Long before 2003 the Marco was dead, buried, and forgotten by Motorola. I mean, good luck but..