On Tue, 9 May 2023 at 15:12, Seymour J Metz <sme...@gmu.edu> wrote: > I believe that the optional source tapes for OS/360 and OS/VS2 3.8 are > archived (CBTTAPE?), so it should be possible to examine the source code > for TEST.
MVS 3.8 TSO modules can also conveniently be browsed at http://www.mainframe.eu/mvs38/asm/TSO%20(IKJ) The first module of the "assign" pseudo-command is IKJEGPCH. It is called by IKJEGMNL (the subcommand prompter), which has special code to check for an a=b type "command". > I would expect it to be something like > > IKJOPER 'Err label',OPERND1=OP1,RSVWD=OPLIST,OPERND2=OP2 > OP1 IKJTERM 'Err label', ... > OPLIST IKJRSVWD 'Err label' > IKJNAME '=' > OP2 IKJTERM 'Err label', ... > > The = is the operator, not a subcommand. Normally a subcommand begins with > a subcommand name and you use IKJSCAN to locate the offset to the > subcommand text; things like assignment statements are special cases. > In IKJEGPCH I see only two IKJPOSITs for the parse. But I'm not sure what it's working on in the command buffer, since IKJEGMNL has diddled around with it. Of course this is the code as of the early 1970s, and so has doubtless changed quite a lot. On the other hand some of it is probably untouched. Tony H. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
