Looks like OS/390 V2R4 (Sept 1997?) contained "A new TCP/IP stack, for applications using OS/390 UNIX System Services (formerly called OpenEdition) sockets".
Prior to that was TCP/IP Version 3 Release 2, which I believe was based on a port of TCP/IP for VM (and written in Pascal!). Or something like that. References: https://www-01.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/6/877/ENUSZP97-0486/index.html&request_locale=en https://www-01.ibm.com/common/ssi/rep_ca/9/897/ENUS296-339/index.html https://groups.google.com/g/bit.listserv.ibm-main/c/M7wIMma2Ig4 ________________________________ From: IBM Mainframe Discussion List <[email protected]> on behalf of Pew, Curtis G <[email protected]> Sent: Thursday, February 4, 2021 4:09 PM To: [email protected] <[email protected]> Subject: Re: TCP/IP relationship to OMVS On Feb 4, 2021, at 4:24 PM, Mike Schwab <[email protected]> wrote: > > z/OS FTP required a RACF OMVS flag in 2001 when I started submitting > dumps to IBM. > I have a vague recollection that in the early 1990s IBM provided a TCP/IP stack on MVS that was ported from VM, but sometime in the OS/390 era it was replaced by a new Unix-based implementation. -- Pew, Curtis G [email protected] ---------------------------------------------------------------------- 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
