The 360/MVT operating system

The distribution linked to here comes with both ASP (the precursor to JES3) and HASP (the precursor to JES2) installed and working. This is what primarily make it interesting.

Obtaining and using it is covered in the Youtube walkthrough for it by moshix which contains a download link for the OS and the video also demonstrates how it starts using ASP and how to start TSO there and use the ASP job subsystem, then also how to shutdown ASP and start the HASP job subsystem instead; so watch the video before deciding if you want to follow the download link provided with that video.

One thing you must remember is that when this OS was released most of the work was done via card reader, you will not find any full screen editors under TSO here; so it is fun to play with but hard to be productive on.

And so I do not lose them some of my notes from the video

hercules
   ipl 150
console
   [enter]
   r 00,u
   *SJSS      // start ASP

   d a          // no d a,all on mvt
   *I,S         // show nodes
   S TCAM                   // no vtam at this time
   S TSO
           tso (second 3270 session) 'logon ibmuser'

   *[enter]   back to console if hung... IMPORTANT console is not in RD by default
(stopping tasks 'stop tso' or 'c asid=xxx')

   Z EOD
   QUIESCE      // before stopall and re-ipl from hercules

------ to switch from jes3 predecessor (asp) to jes2 predecessor (hasp)
------ note: no ipl, just console commands
   STOP TSO
   Z TCAM
   D A
   START HASP
   $DA

   $HASP TERM
   $PHASP,END
   Z EOD
   QUIESCE