Hi,
Sorry for the clumsy title, here is some more information on the clone version of the HP Series 80 (HP-85, HP-86, HP-87, HP-9915) Programmable ROM Module - 82929A.
Here is a picture of the lastest prototype from Bill K the maker:
http://www.vintagecomputers.btinternet.co.uk/hp80/pics/clone_prog_rom_module_prototype.jpg
This has the ability to store multiple ROM images (eg Assembler, Extended Mass Storage, EDISK, I/O, Mass Storage) as well as user programs.
More details once I get my hands on it, still yet to have a plan for general availability.
Regards,
John