The comment > Thank you for the review of Terry's OS . He evaluated things from his own unique prospective. when still in high school he was using a C 64 to do his calculus homework the teacher called him on it and he said but I wrote the program ...after explaining the program he was allowed to use it but still had to do 1 problem a day by hand . I tried to get him to write a game program to use a exercise bicycle interface I had made the faster you peddle the faster you man would go on the screen it was fun to out run the ghosts in packman and worked well with joust .. he looked at it and dismissed the idea " no one wants to exercise to computer games wouldn't even let me pay him to do it ... this was 1985 well before x box and Nintendo had any interactive games ( sigh.. what could have been ) The last picture you have of him on his left is what he called a shaper he made a 3D milling machine out of a dermal tool it worked well carving a bar of soap or balsa wood but wasn't smooth ( chatter from a flexible frame and a rotary file bit not a milling bit that he needed ) so he tossed it in a dumpster :( .. What he didn't realize was the mechanical problems were easily solvable ..the most amazing part of it was that he could give it a CAD drawing of a part and it would figure out the tool path so a self programming 3 D milling machine WOW !!! As a Millwright I can tell you that program was light years ahead of its time ... Terry Davis was my younger brother RIP Terry ... Kevin Davis