I did try both ROM sizes (512 and 256) but we still get the same issue. However am I right in thinking the ROM for these drives is pretty much generic, it is only the NV-RAM which is unique. So using another ROM with the exiting NV-RAM might work?michael chiklis":3jyn24tz said:As i know, PC3000 has a bug that does only 50% ROM backup from Hitachi ARM drives, also MRT has this same bug.
I don't know if acelab corrected this bug in last update, maybe yes and this would give a sense on why now you get full rom dump if you recently updated it.
I compared both NVRAM copies in your rom, they are identical, so i don't think nvram is corrupted.
I would try to write entire 512 KB patient rom on donor PCB with external programmer, let me know if this solves the problem.