I do not know, if it helps, but in this thread (last post) there is another adapter (for one 27C010):
Hi all, I have a Mac SE showing a barcode-like pattern: A friend of mine has the same computer, so we swapped parts until we found the culprit: the 342-0353-A (rom low) chip. I got the BIN image on the web (64 kB), but I don't know if I can use a 27c512 eprom as direct replacement or not; do...
forum.vcfed.org
There are two 4.7kOhm Resistors used to connect the 5V to VPP, PGM and OE.
I think that this is used in the same way in the above adapter.