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I may but I won't know for about a week. I'll pm you or find the thread if I need one. Still $23?

Does anyone have one of the battery holder boards described in this document? I'd like to recreate it for my unit. http://tim.id.au/laptops/apple/legacy/macintosh_ii.iix.iifx.pdf

It sounds like your running the SMI from the share. If you copy it to a HFS formatted drive it will work.

A little IPA will clean that off. It's common for those to get sticky. In theory you'll want to reaply some dielectric grease or paint around the edge to prevent arcing.

https://www.digikey.com/product-detail/en/adam-tech/PLCC-44-AT-SMT/2057-PLCC-44-AT-SMT-ND/9829298 Or any friendly electronics supplier. Count the pins and slap that number on the end of PLCC- and you'll likely find a socket.

Decent video on the subject. https://youtu.be/ref9JHUf-uw

Make sure the terminals are not bent down from the weight of the battery. This was a common problem in the day.

Wire or if it's small enough you may be able to bridge with just solder. The. If you have some put a little solder mask back on it. Also I'd you want to save your chip more heat get a socket for that chip solder that on the drop the chip inside.

I like this idea. PCBWay has some information about edge plating on their website. https://www.pcbway.com/pcb_prototype/PCB_Sideplating.html I went a slightly different way and made a battery holder replacement. Technically OSHPark doesn't do castellations but it works fine for the prototype...

Mine were the following model numbers. Both were made in Singapore. Classic II (Oct 1991) 630-0525 Classic (Nov 1991) 860-0395 For the most part the caps were the same. I ordered double of what was in my CII but when I went to do the Classic I found I was missing 2 caps that were different...

My CI and CII were slightly different. 

Forgot the link. https://archive.org/details/macclassicse00larr

Read through cheaper 9 of this book. You'll find most of your answers there. It's likely you need to replace the opto coupler. What version of AB do you have? CP1 should be available from any major electronics dealer. For sound my CII originally had scratchy sound then lost it all together...

That's should do it. Being it's only a single sided board it's a lot easier to desolder. 

In regards to the RTC replacement. If you have to build an adapter board anyway could you not just put an RTC chip + translator AVR on the board. Use the RTC to keep time then the AVR for PRAM + comms translation. If a pulse is needed pick one with that output and map it to the pinout. Totally...

So I looked at debug level logs on netatalk. It seems to be some kind of timeout. After which atalkd kills the process. I swapped my Classic II out of storage and it's working fine with the Farallon adapter no file share disconnects. So maybe the Classic is too slow with 7.5.5 on it. I'll have...

See chapter 10 of the Mac Classic & SE Repair and Upgrade Secrets book for ideas on the checkerboard. http://maccaps.com/MacCaps/Repair_books_files/Mac Classic %26 SE Repair and Upgrade Secrets.pdf

My comment wasn't about direction. The ROM chip is 40 pin. The socket is 42 pin.

On the Classic you'll also get that if the ROM is seated shifted the wrong direction. I did that accidentally once when replacing it.

Pretty sure for the board that BOM is for the only difference is minus 1x 220uf 250v cap (due to JP1 being in place for 220v) and swap the other 220uf 250v for a 400v version. At least based on comparing my list to recapamac.com.au's board. Similarly, Console5's list for the older boards it has...