If your rom is plugged into an Amiga you can
download remus. Under the tools folder is a program called Romripper. There's a readme that explains it but basically depending on your rom you'll want to use something like:
Code:
romripper ram:dump.rom F8 512K
Which will dump your rom to the file dump.rom. For writing I use a TL866-II with adapter. I've heard some people have had success with a CH341a but I haven't tried.