On April 11, 2019 at 4:29 PM Mike Myers wrote: | an experience I had sometime back around 1967. | Nearby at another system was Don Ludlow, who | was reputed to be the primary designer of IOS | for OS/360.
Donald Ludlow WAS indeed the principal author of OS/360 IOS. In fact, he wrote ALL of the code that actually survived and was shipped. There was another gentleman who CLAIMED to be the "author" of IOS (whom I knew personally), but everything he did had to be redone by Don (or mostly, in fact, simply thrown away). Mr. Ludlow moved to Raleigh, NC and worked on SPF (as it was then called), incorporating the SUPERC FDP into ISPF/PDF as what we know today as options 3.12, 3.13, and 3.14 (a "recent" enhancement adds 3.15). He wrote some of the slickest, tightest S/360 Assembler code I've ever seen or had to modify learning a lot about device channel programming from it (and from him). William Blair Houston, TX ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
