Intel had an operating system (ISIS) and a language. I worked for a hardware startup and we used them. It was an embedded, bare-bones OS that could be burned into ROM, PROM or EPROM.
I remember the language better, having struggled with it many a late night. It was called PL/M, programming language for microcomputers. Ha! You can find anything on Wikipedia: https://en.wikipedia.org/wiki/PL/M and https://en.wikipedia.org/wiki/ISIS_(operating_system) . (Did not realize it had been written by the late, great Gary K.) It had some quirks. ! (exclamation point) was the address-of operator, like & in C. Try spotting an extra or missing ! on a dot-matrix printer with a tired ribbon. 8-bit integers that were fundamentally unsigned but could be treated as signed. So you could say FOO=-1 but then (FOO < 0) would be false because fundamentally -1 was just a synonym for 255. Charles -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of Tom Marchant Sent: Thursday, March 23, 2017 4:58 AM To: [email protected] Subject: Re: GREAT presentation on the history of the mainframe On Thu, 23 Mar 2017 02:27:32 +0000, scott Ford wrote: >One of my first sysprog jobs was on a 370-155 un-dated ..no dynamic >address translation ran Intel's DOS look-a-like. ITYM IBM Disk Operating System, which predated Intel by years. It is nothing like MSDOS. Did Intel ever have a DOS? ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
