I have an Apple Miniscribe 8425SA that an Apple shop had received but never even opened the box. I opened it to make sure it worked.

It uses a 27128 EPROM. I have an EPROM Duplicator which will make copies or I have a burner that only handles 2764 and smaller EPROMs. So I can either make you a duplicate  and test it or I can read the EPROM in 2 parts