At the Chicago SHARE 43 meeting in August, 1974, IBM had invited attendees to a demonstration of the new MVS operating system on the 145 at the Chicago Ed center. At 8 p.m. Tuesday, three attendees found the IBM demonstrator on duty was enthralling an attractive lady with his expertise. Not wanting to be interrupted by three males, he said, "Go play with the system on that user TSO terminal over there -- you can find out how good the security of an MVS system is for a typical TSO user". The challenge was accepted, and in short order, "Tim W." observed that SYS1.NUCLEUS was not protected, so he scratched it. "Tim W." knew that once the system is up, the dataset SYS1.NUCLEUS is not read again, so the SHARE demonstration continued without a flaw. It was later heard that IBM took the SHARE MVS demonstration down at 11 p.m. to IPL for a customer benchmark; it took until 3 a.m. for IBM to find a CE who could correctly decipher the wait state code and explain that the IPLs kept failing because there was no SYS1.NUCLEUS on the IPL volume. Barry Merrill
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