> Due to the cable being too long, it was taking x + y microseconds. Must have been nanoseconds, right? Electric signals travel at approximately 150,000 miles per second. That's somewhere around 800 or 900 feet per microsecond. That would be a long cable.
https://youtu.be/9eyFDBPk4Yw Charles On Tue, 18 Feb 2025 20:07:16 +0000, rpinion865 <[email protected]> wrote: >Hey, I know how to fix that. Old story, new IBM 370/158 installed by third >party. IPLed 158 and it ran for a few hours and then died. IPLed again, same >thing. Third party CE attempted to diagnose the problem. After several >hours, the third party gave up and agreed to pay for IBM to diagnose the >problem. Local CEs unable to diagnose the problem. Problem escalated to >level 1 & level 2. Still no solution. After 24 hours of this, IBM flew in >one of the 370/158 engineers to the site. The engineer asked to IPL the 158. >After a short time it died. The engineer walked to the back of the 158 and >removed the panel. After a few minutes, the engineer said there was a wire >that was too long. Everybody on site thought "yeah right". The engineer >created a shorter cable and installed it. The 158 was IPLed and it ran >without a problem. The IBM engineer stated it was a "timing problem" because >a signal was supposed to reach its destination in x microseconds. Due to the >cable being too long, it was taking x + y microseconds. > >No, this is not an urban legend, it really happened. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
