Old PC's circuit boards, prior to be put in the IT skip/container. Snapped for posterity, as these use the uncommon Micro Channel Architecture (MCA), that never really took off as a new or alternative way of processing data. We had just a few such machines with 80286 and 80386 processors in the early 1990's. To the users operating them, they were just another PC, and worked well enough. Far too old and slow for current use.