Talk:IBM Series/1
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S/1 was also used in the airline industry, but in a white rack-high box. They have been equipped with 8 inch floppies to load the microcode and OS.
The funny thing on that kind of machines have been the line of LED blinking like K.I.T.T in knight rider, indicating the CPU load (slow=high CPU load, fast=low CPU load)
I know a airline where a couple of this machines have been used for X25 communications until mid 2001 (Yes, they have been made Y2K!)