Hi Jeff,
Coincidentally, I was reading through my copy of the Commodore-Amiga 2nd Annual Developers Conference Notes (from 1986) this morning.
There are two articles which cover installing Kickstart EPROMs in 2-layer A1000 boards. There are several different methods, two of which remap the old Kickstart WOM/RAM to $F80000 (you use an AddMem program to manually add the memory at $F80000-$FBFFFF).
I'm anyone wants I can scan or type up the relevant pages. That should help a lot with your understanding of what's involved and the different options.
The EPROMs on your A1000 board look quite professional. Maybe they were done by a dealer, or maybe Commodore supplied the EPROMs to registered developers???
Update: Reading some old Usenet postings, it was mentioned that a company called CMI marketed a ROM conversion kit for the A1000. That probably used the same method as in the Commodore instructions, and included a set of EPROMs (presumably under license from Commodore). Maybe that's what you have in your machine?
-- M
