"Core" technology, pun intended. Remember core memory? You had to do a write to do a read. If the write changed the data, you had to do another write to restore it! You then knew if a "1" or a "0" was stored. I've still got some core memory-cool stuff. Leonard KS4RD From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On Behalf Of Douglas Goodall What does it mean if I remember the original? I guess I would have to check the datasheet to see if it requires any special glue logic. A useful enhancement might be to add a sense wire that would carry back a very small signal if you wrote a pattern into the WOM that was different than what was already there. Of course if the only way to read a bit from the WOM was to overwrite it, you would have to rewrite the data after you destroyed it . I believe that is the core technology required in this case. Douglas :-) Goodall On Apr 1, 2013, at 5:25 AM, Crusty OMO <crus...@hotmail.com> wrote: OTish: Write Only Memory, Signetics 25120 -- -- |