I believe that the 3279G used APA rather than PSS; GDDM supports both.
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Discussion List <IBM-MAIN@listserv.ua.edu> on behalf of Bernd Oppolzer <bernd.oppol...@t-online.de> Sent: Monday, November 27, 2017 9:51 AM To: IBM-MAIN@listserv.ua.edu Subject: Re: Graphic output on the mainframe Maybe dump question: would a manual describing all the GDDM calls (from Fortran, for example), be sufficient? Or is a lower level of definition needed? Is GDDM the only way to access the graphic functions of the 3279 G graphic displays? I recall that I had some problems in the 1980s, because GDDM expected for all function calls that the leftmost bit be set on the last parameter address, which Pascal didn't; so I had to build ASSEMBLER glue functions for every GDDM function which inserted the missing leftmost bit at the position of the last parameter address. This was expected by GDDM, although the number of parameters was fixed. I had a GDDM manual at that time which contained descriptions for all GDDM functions; IIRC independent of the calling language (the "normal" calling languages were Fortran and ASSEMBLER, obviously ... both using call by reference; because Pascal supports call by value, too, setting the high order bit in the parameter list is normally not a good idea). But this GDDM manual is long gone ... sadly. Kind regards Bernd Am 27.11.2017 um 15:17 schrieb Greg Price: > On 2017-11-27 7:22 PM, Bernd Oppolzer wrote: >> run on my 3279 G display > > And this time I'll get straight to the point. > > I would pay money for a 3179-G manual. > > Why? > > Because while using programmed symbols is documented in a current > manual, using 3270 vector graphics is not. > > It used to be documented in the relevant hardware component manuals, > but since those pieces of hardware are no longer marketed, the manuals > have disappeared. > > So how would TN3270 client writers figure out how to support vector > graphics? Probably with a lot of VTAM traces of GDDM applications' > TPUT traffic. > > Anyway, just sayin'. > > BTW, did I mention that after 10 years, I'm out of IBM since the end > of last August? I wonder if they didn't think I was trendy or "with > it" enough. With my interest in bleeding edge technologies like 3270 > graphics, that can't be right. Never mind blockchain - I say let's > think block-mode terminals! > > :/ > > Cheers, > Greg ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
