I have posted the schematics and software utilities for the bubble board on the SBC-85.COM project website under the Documentation tab.  and will continue uploading and (continuously) updating the remaining documentation and eventually the gerber build files.  Look now if you want a sneak peek at the documentation, however it will take me a while to flesh out everything including the BOM and all the details, so check back for a newer version now and again.  Version 1.1 of the 7110A bubble board is already in the mail and hopefully I did not make any embarrassing mistakes when making the relatively minor updates from v1.0 and switching to the 7110A 20-pin.

I have contacted some people (repair houses) that I suspected would have bubbles, and indeed there are 7114As out there and somewhat available; but there is more than an order of magnitude variance in price.  If you are planning on building bubble board,  you may not want to buy the first 7114A bubbles you come across.   These are for new old stock, or removed from service, tested, and known good bubbles from repair houses, not just some random bubble on the internet.

As always, let me know what is missing from the documentation, what is not clear, and what is outright incorrect.

regards

Craig