This page features some pictures of a 10,000 Bit magnetic core memory. After relays and vacuum tubes, but before RAM memory, there was core. Even today, core leaves its legacy. An inelegant program which uses a lot of RAM is occasionally called a ‘core hog’. When programs abended (i.e. crashed), the operating system would print out the contents of core for diagnosis. In the UNIX and Linux world, the diagnostic file containing the memory dump is still named “core”. That’s why someone who talks too much is sometimes nicknamed ‘Coredump’. Many thanks to Peter and Susan Wesoly for preserving this bit of computing history.