I ran a batch
of MOS 6540 adapter PCBs, and I have created a small
FLASH replacement for the 2364 and 23128/23256 DIP ROMs. Some of
those might be of use on other 80's era machines.
I think that those would be quite valuable, especially if you decide
to create variants that allow a similar drop-in replacement for older
EPROM parts.
What EPROMs are you looking to emulate? I'm game to design some
more
layouts.
Jim