YES<br><br>I was right, one of the 444C-3 memory chips is bad, I just did not want to wait for new chips and installed sockets on the io board, so I could swap the memory from the IO board of the LISA 2/10 and voila, the ROM is seen correct. <br><br>Now I only have to make a boot floppy to start it up :)<br><br>Problem remains with the CPU Board, I think I will try finding some RAM chips for this board also because I think those might be also bad :(<br><br>As Dexter says " This was a fine day for science :)) "<br><br><br>marți, 8 ianuarie 2013, 19:55:11 UTC+2, Alex a scris:<blockquote class="gmail_quote" style="margin: 0;margin-left: 0.8ex;border-left: 1px #ccc solid;padding-left: 1ex;">Hello all, <br><br>First of all, thank you for the schematics, it really helped. I took the time and checked every connection between all pins of the floppy controller part, swapped and changed the 6522 for good working ones and no luck. At least I can now rule out a short circuit or a bad solder joint. For the moment, the only thing I can think of is one of the static ram chips 444c-3 is damaged. I also noticed, one of the two chips is made by NEC and the other one is SCM, on the IO Board from my LISA 2/10, the two 444c-3 are socket-ed and both NEC chips. (this must be the reason why they socket-ed the chips). I think one of the two 444c-3 must have been already changed by the previous owner of the Lisa (I am starting to think this was a Lisa assembled out of non working parts&nbsp; :( ). Now I only have to find two good 444c-3 chips to test with them. I will install sockets for those to be easily changed if necessary. <br><br>If anybody has other ideas about other possible sources for this error I am happy to hear about :)<br><br>Have a nice evening!<br>Alex <br>&nbsp;<br></blockquote>

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