Thanks, I did not realise you had already translated it to English. I see. The Elliott machines were the same (but not the ICT1301), keeping the gun of a tank level and aimed in the right direction, accepting data from gyros and inertial sensors and tracking the position and orientation of an aircraft or ship, cross checking with compasses and other navigational systems, analysing sonar data and tracking enemy submarines etc. By the time of the 920ATC we even used a special real time programming language called Coral66, based on Algol60 syntax but with cut down semantics to give highly efficient run times. Before that everything was done in assembler (called S.I.R.) or machine code. Possible application for computers in video back then were superimposing images and standards conversion and just possibly titling and graphics. If it has two or preferably three digital to analogue converters then a vector display is fairly easy, but maybe it was more complex than that, and you only need one digital to analogue converter for a raster display, provided you have enough CPU power to both drive the display in real time and do any processing required as well. I should explain what I said about two or three A/D converter, you have one to drive the X plate and one for the Y, ideally one for the brightness (Z), but with a fast enough converter, you can deflect the beam so fast so it will not mark the screen significantly and so no need to turn the beam off before moving to the next item to be displayed. I had a look but my understanding of French is terrible, and technical details in French are even more difficult. As I understand it, that is what the big museums call preservation. There has been a lot of discussion of the relative merits of preservation and restoration. Restoration is what they call it when we return a computer to running condition, preferably so it can be demonstrated. There is some truth that restoring a computer always destroys some of the original and that preservation is, to the purist, a better thing to do. As I have two 1301s, I have the luxury of being able to restore one and preserve the other, but restoration is a lot more enjoyable to me. The other thing of course is simulation. This can be done at various levels, simple simulation of the instruction set, more complex simulation at gate level and in theory the ultimate would be to have a 3D model of the computer you could walk around and inspect the inside of, and attach a virtual oscilloscope to and watch the analogue signal levels and be able to do hardware patches and have simulated hardware faults and diagnose and repair them whilst the lights and switches all worked like the real thing and the sounds and 3D models of the peripherals would also be like the real thing. Maybe I'd leave out the sound of a card deck being mangled and thrown into the air by the card reader though. Good, are you able to identify the function of each type of board (such as 'And' gate, Flip-Flop etc) If not I could perhaps compare with my 1301 schematics and see if they have any similarities. How difficult is it to identify the power supply connections? Are you planning on doing schematics for the board interconnections? I imagine this would be very difficult, so probably best not to try.