Dr. Alan Scherr told me over dinner years ago that on the final night of testing TSO before it's first release, they had taken a "dinner" break at 2am, and when he came back, he logged on and could enter commands, but there was no reply to his terminal, until, many minutes later, a co-worker across the room noticed that there were a bunch of replies to his commands on a different terminal. Alan then realized he had previously been logged on at that terminal, and after dinner had logged on at a different terminal, and there was no protection nor design for multiple logons, so at 3am he added the exclusive enqueure for userid in SYS1.UADS to prevent multiple logons, and TSO shipped at 7am on schedule to PID.
As an aside, he reminded me that when the initial TSO performance did not match his model, his team modified the product to match the model. He then went on to develop VS2/MVS, immortalized in John Chapman's 1976 SHARE button http://www.mxg.com/thebuttonman/resultPOP.asp?d1=button&d2=167 Barry Merrill Herbert W. Barry Merrill, PhD President-Programmer Merrill Consultants MXG Software 10717 Cromwell Drive Dallas TX 75229 214 351 1966 tel 214 350 3695 fax www.mxg.com ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
