<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">
OS/360 became OS/370 which became OS/390 which became zOS. I think OS/360 was based on earlier platforms that were not considered "mainframes". I learned to write 360/370 machine code back in late 80's to diagnose the hardware. Only IBM writes MVS code but I think people that call themselves MVS programmers write JCL (job control language) and know how to install and maintain MVS.<div><br></div><div>I used to know some guys who could look at the 1 and 0's that were saved at each clock cycle in the cpus and tell you what operation the computer was doing and if it was working. Still blows my mind.</div><div><br></div><div><br><div> <span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0; "><div>Mark Wright</div><div><a href="mailto:m.perry.wright@gmail.com">m.perry.wright@gmail.com</a></div><div><br class="webkit-block-placeholder"></div></span><br class="Apple-interchange-newline"> </div><br><div><div>On Mar 4, 2010, at 11:50 PM, <a href="mailto:wolf@wolfhalton.info">wolf@wolfhalton.info</a> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"> It is difficult to get IBM mainframes to play with, but I want to at least see z/OS at some point. I have seen a little of MVS and fellow list-member Mr Bass has told me about MVS on Linux, which we have messed with but I (at least) haven't gotten to work. z/OS is a more recent development from OS/390 (or is it OS/360?). Any ideas? <div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">_______________________________________________</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">Ale mailing list</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><a href="mailto:Ale@ale.org">Ale@ale.org</a></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><a href="http://mail.ale.org/mailman/listinfo/ale">http://mail.ale.org/mailman/listinfo/ale</a></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; ">See JOBS, ANNOUNCE and SCHOOLS lists at</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; "><a href="http://mail.ale.org/mailman/listinfo">http://mail.ale.org/mailman/listinfo</a></div> </blockquote></div><br></div></body></html>