Tonight’s task is getting to the bottom of the keyboard scanning on my Tandata PA. Time to break out the logic analyser!
Ken Shirriff (Retweet)
Mon Apr 15 16:16:34
In the 1960s, mainframe used core memory for storage; 128 kilobytes filled a large cabinet and weighed 610 pounds. Core memory consisted of tiny ferrite cores on a wire grid. By 1970, IBM produced 20 billion cores a year. I examine an IBM S/360 core array: