Now, as is normal for me, this is hazy, but I think I remember what you are talking about. Intel used a format they called "object module format" that had header information on each block, and several possible blocks. As I recall, the MCS48 family, due to its limited memory addressibility, used the same OMF (object module format) as the 8080. Naturally, since Intel defined it, all their tools could read and write it. IPPS was the name of the software used to read and write EPROMS, etc, using Intel's iUP-201 programmer. All that being said, I think I can help you. If you don't have anything that can read and understand Intel's OMF, I do. I have a working system that can execute IPPS. There are other utilities in the Intel operating system, ISIS-II, that can also do this. I should be able to convert your OMF file to an Intel HEX format file. Intel HEX is very common and most programmers can understand it. It is also block oriented, but ascii characters rather than pure binary. Sorry to be so wordy, but bottom line is this. (into Technicolor dream mode) If you send me your OMF file I can convert it to HEX and send it back to you. Hope that will help. Dave Robert Maxwell wrote: -- Dave Mabry dmabry(a)mich.com Dossin Museum Underwater Research Team