HP82971 ROM/EPROM module

I've just got an HP82971A RPTOM/ROM module on E-bay... I thought from the description and part number that this was probably for the HP Integral PC. And it seems I was right. I've not fully investigated it yet, but I've traced a few connections from the DIN 41612 connector through buffers to the EPROM sockets, and they all make sense. It's a single PCB, normal Integral expansion card size, with the plastic cover on the bottom and the normal bracket on the back. On the board are a few TTL chips, mostly buffers, 16 28-pin DIL sockets for the EPROMs, 3 8-poisition DIP switches and not a lot else switches set the start address and also configure the board for one of 3 different types of EPROM (I would guess either 2764, 27128, 27256 or 27128, 27256, 27512). I think all EPROMs have to be the same type. The sockets are helpfully labelled 0L, 0H up to 7L, 7H. There's also a 64 pin header socket and mounting pillars for a daughterboard. The socket iw wired pin-for-pin with the DIN41612 socket that plugs into the Integral backplane. And the 2 EPROM sockets near the centre of the bracket are actually individual contacts soldered into the PCB, thuse making those lower profile than the others and leaving space for a connector on the daughterboard to come through a hole in the bracket. I am sure the hardware won't bother me at all, but I don't know the format of the ROM images. I asusme they appear as a read-only filesystem to HPUX, and that there are therfore headers in each EPROM containing the filenames, sizes, start location, etc. Any ideas as to the format of that? -tony