After doing some more googling all I could come up with was this: http://retro.co.za/ccc/mac/index.html
He mentions someone called "Kryten Droid" who made some info on the PALs, but the link to Kryten's website is dead. And web.archive.org only has the homepage and directory of the files. Not the actual .htm files themselves.

Click to expand...

That would be me

I have Kryten's pages as well as Jecel (the fellow in Brazil who gave the info to Kryten) mirrored. The thread that started it all is here

http://www.fpgarelated.com/usenet/fpga/show/18121-1.php

I'm reverse engineering the PALs on my Mac Plus, just for fun. Either I have a bad connection on the Expro ZIF socket, or half of the BMU1 PAL is unused. Once I have the correct equations for BMU1 and CAS I'll move on to the registered PALs -- that's bound to be fun.

My web page on this is a bit immature for release, but I'll link it in when there's something useful there.