RPG on the System/360 Model 20 definitely existed. There was "Model 20 Card RPG," as an example -- Bitsavers has a manual available (GC26-3600-7). Here's the direct link (watch the wrap):
http://bitsavers.trailing-edge.com/pdf/ibm/360/model20/GC26-3600-7_360_20_Card_Programming_Support_Report_Program_Generator_Oct70.pdf I assume IBM also offered RPG for TPS and DPS since CPS was the smallest "operating system" available for the Model 20 and could run in as little as 4K of memory. You can even still find Model 20 RPG programming manuals available for purchase (used) on Amazon and elsewhere, e.g. Aloyse Oberle's book published by Prentice Hall. I assume it was also technically possible to run RPG (and FARGO for that matter) for the IBM 1401 on the System/360 Model 20 in 1401 emulation mode (Submodel 5 machine). IBM offered an upward source compatible path into the rest of the System/360 range and beyond -- and, for a period of time anyway, binary emulation. RPG for BOS/360, for example, could (according to IBM's documentation) handle Model 20 RPG source code without modification. There is still an IBM supported RPG II compiler available for z/OS (IBM Program Number 5740-RG1). If your goal is to (re)compile some Model 20 RPG source code, give that (licensed) compiler a try. As for where you'd obtain any of these compilers (except obviously 5740-RG1), I'm not sure. You could try the roughly five organizations that have actual Model 20 machines in their collections. They include the Living Computer Museum in Seattle, the Computer History Museum in Mountain View (California), and the Deutsches Museum in Munich, as examples. IBM Research in Boeblingen, Germany, also apparently has a Model 20 on display, and (allegedly) it's a working model -- though I have no direct knowledge of that. You could also try asking W. Van Snyder at NASA's JPL who (it seems) has also been trying to track down these older compilers. -------------------------------------------------------------------------------------------------------- Timothy Sipples IT Architect Executive, Industry Solutions, IBM z Systems, AP/GCG/MEA E-Mail: sipp...@sg.ibm.com ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
