Hi, Thanks for information. I have added your comment on my http://pichotjm.free.fr/Multi8/Multi8.html page. Do you accept that? I have found 2 more photos showing me working with another Multi 8 configuration, but i have to restore them (many scratches, white dots...)! May be from 1972. I was debugging one of these applications: http://pichotjm.free.fr/Techno73/Applis/Applis.html Electronic contains the first microprocessor 4004. Unfortunatly, i have no document about this. JMP