[Coco] Eprom for fd-502 and DW ?

[Charlie]

Hello./

I'm going to ask a friend to burn for me, the DW roms for coco1 and coco2.
I will use them in my FD-502 controller.

What type of eproms can I tell him he can use?
I understand the rom needs to be written to the upper 8K ?
Anything else I should be concerned with ?

Thanks

Charlie