WTG tables are characteristic of O/C/EOV; most type 4 SVC routines didn't have one.
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Discussion List <[email protected]> on behalf of Giliad Wilf <[email protected]> Sent: Wednesday, September 25, 2019 9:29 AM To: [email protected] Subject: Re: Xpediter: Same Debugger from Competing Vendors??? On Tue, 24 Sep 2019 20:29:18 -0500, David Staudacher <[email protected]> wrote: If memory serves me right, the roots of Xpediter-type software are in a shop that wrote a module that had been inserted into SVC51's (SDUMP) control flow. In those days a large SVC routine was comprised of several pieces, each having a WTG (Where-To-Go) table at the end, comprised of several entries, with each entry containing the name and TTR of the next piece to be loaded and given control, based on decision made in the current piece. The shop wrote a new piece to be the 3rd to be given control on SVC51's flow, and redirected processing to code that enhanced debugging, then returned to the appropriate point on the normal flow through its own WTG table. A special utility IEHIOSUP had to be invoked to refit TTRs on modules' WTG tables after applying PTFs. >Earliest reference yet to "ADS Xpediter" - October 26, 1981 (lower left of >page): >http://secure-web.cisco.com/1uz-ox0PtaceSDeJuoNSnNZoWqfJhe5dAFCOUVYFUqK1qVk3pt4Zntiik0DcJLgVKzDNXQkBO0o2FRBN6hvY2_sdNZ7j_kA6zhXDUmBLQC7lg_i6erF5wVGM1HhBwm9B4Je3WujW2RMdbJqWxFWdl_2x4TzTf1_qN_WpaWdWhF4p2Ez5UUvRKgBAp8QSKQCR8jByjhNgqJwonwEgNuyqyKd55oR5ay3vCdIRfPZsxi01X5U89oXHLx9svqwQXLq6ZBDlaprv3dGZ4igk88ShV01agkRAhCvnk7KNyjx-JGE6asv0F8E6_kY5a4E_wnLyGJsoy9L1rpDSwwoSmIMPba3bgqOGLpG2GgsC4XcyEhH6GfwaLQCP5gL12-fnk3at2L7-6CLwMLxgO4MF40Ygo_ULQstiWlT61-KvRK2k8azdLDy6B_CJKkfKCKi18bM_8/http%3A%2F%2Fbooks.google.com%2Fbooks%3Fid%3D1REkdf3I86oC%26pg%3DPA46 > >---------------------------------------------------------------------- >For IBM-MAIN subscribe / signoff / archive access instructions, >send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
