I love the PDP-8, to the extent that, 50 years since my last contact with it, I still remember that HALT was octal 7402. But the blinkenlights in the movies cam

I love the PDP-8, to the extent that, 50 years since my last contact with it, I still remember that HALT was octal 7402. But the blinkenlights in the movies came from mainframes, with row after row of flashing lights. There's a story about the IBM System/360 Model 75. The engineers who designed the Model 65 put the registers on roller blinds, so that one row of flashing lights could display one of several different registers. The plan was to do the same for the much-faster Model 75. Senior management is said to have nixed that: if the machine costs 3 times as much as the 65, it must have 3 times as many lights. So the 75 lost its roller blinds.