Reverse-engineering Snap (Panasonic HHC)

Hello Eric (and other HHC users), all this talk has made me dig out my Panasonic HHC - I also have the printer (RL-P1004A). Unfortunately I have no documentation and no ROMs that allow any sort of programming AFAICT... I have 6 ROMS, 4 dated 10/02/86, and two 08/18/87. They appear to be (c) QuadROM. I don't think they would be of any particular interest to anyone (unless you need to recalculate your 1986 RRSP contributions for your Quebec provincial tax) but if anyone wants them to examine/archive I'd be happy to send them. Does the order of ROMs in the sockets matter? I would assume so - but there is no (obvious to me) indication of which ROM would go where. How difficult would it be to copy a ROM? The bank ROMs are simply EPROMs with sticky paper labels, I think I could simply erase one and the reprogram it with a homebuild adapter so as not to damage the carrier... Is there any information out there on how to program the HHC in 6502 assembly? memory maps, keyboard and LCD interface, etc... Joe.