The TSO userid is eventually stored in the PSCB control block (mapping macro IKJPSCB).
The PSCBUSER field is only 7 bytes long (for some strange historical reason) and is unlikely to change due to downward compatibility issues. It might have something to do with "SUBMIT" processing or it might have its root in SYS1.UADS access - however I am not 100% sure about either. Rob Scott Lead Developer Rocket Software 275 Grove Street * Newton, MA 02466-2272 * USA Tel: +1.617.614.2305 Email: [email protected] Web: www.rocketsoftware.com -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of Robert Birdsall Sent: 05 November 2010 12:07 To: [email protected] Subject: Why are TSO IDs limited to 7 characters This is a curiosity question sparked by another thread. The limitation of 7 characters for TSO IDs has caused us extra work in the past (we use IDs of 3-8 characters across the institution, but the mainframe can't use the institutional IDs in part because of this limitation). What is the underlying technical reason for the restriction? Thanks for any insight. ---------------------------------------------------------------------- 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 ---------------------------------------------------------------------- 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
