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One of the boxes I received:

These are from the Macintosh II Repair & Upgrade Secrets. The third screenshot delineates which Mac II has which PSU.

The Mac II/IIx and IIfx can have either a Sony or an Astec PSU. The IIfx PSU is "thermostatically" controlled so that the fan speed varies with temperature, whereas the II & IIx's PSU goes full blast at all times. Otherwise, they are identical I believe.

Good to know! I guess if you have an '881 FPU and you intend to make use of the Math Co-processor on your vintage Mac, it would be worth upgrading to the '882.

I was able to get a PMMU for my Mac II for not too much. I don't know about speed increases, but I know it enables more RAM to be available. I believe it's also required for Virtual Memory (not that I plan on using it for that).

You may be correct! I am by no means an expert on the subject. Will be interesting to see the side-by-side.

Ugh, horrendous.

As for 68881 vs. 68882, any difference will be marginal, assuming they're the same clock speed. My understanding is that the 68882 was essentially a bug fix.

An FPU will only noticeably affect performance when using applications that are designed to make use of them for Floating Point calculations. 3D graphics, spreadsheets, and other such programs.

That particular seller lists things for nonsense prices anyway.

The standard AEHD does not read 1.4MB floppies on a Mac Plus to the best of my knowledge. The AEHD+ is unique in that it takes care of handling HD floppies in lieu of the floppy controller in the Mac Plus, which is of course unaware of them. That's my understanding anyway. In either case, both...

Exactly.

What I had really wanted was the AEHD+ drive, but it went above what I was willing to spend for it. I hope whoever won it received it one piece...

So I just got the last of several boxes of stuff I won in the Mac repair store auction from "Auction House 282" on HiBid. My goodness, was it packed poorly! Most of what I won were disks and books, and the sellers made almost zero attempt to secure or protect anything in the boxes. Some packing...

It does seem to be a device begging for a purpose, but it's neat all the same! I do wonder if it would function as a KVM if you used it in reverse...

I believe that all the devices that I have do indeed have pass-through ports, so not sure.

Not sure about Modems and Scanners, etc... They may have just been adding possibilities for marketing reasons.

There were non-serial devices that were ADB. Gamepads/joysticks and graphics tablets come to mind.

Hmm, according to the original item description, despite being called a "switch", it's really more of an ADB hub than a KVM, which happens to have a switch for the various input devices: "Connect up to 3 ADB devices to your Mac computer." "Each ADB port will be able to access up to 3 devices."...