Have you looked inside the box? I used to have some old Concorde test equipment circuit boards (at least, that's how they were described by the hairy old engineer from BAe who gave them to me), and they had what looked like banks of flip-flops configured from very 60s era metal-can transistors. Is your computer discrete components too, or MSI?
It would be a worthwhile if time-consuming project to collate as much information about the Conc's avionics, while there are still enough people around who worked on them.
R