Os390 Vs Zos Top Differences

All may not be aware of these differences sometimes. Yes, all mainframe professionals are experts in the technologies, but in these not that much. Knowing a little bit about architecture will definitely keep you ahead.


  • It is 64 bit processing system
  • it was introduced in 2000
  • It supports all mainframe technologies, C, C++, Java and SAP, Cloud
  • It is like all modern Operating systems


  • It is  31 bit processing system
  • it was introduced in 1990
  • It supports all mainframe technologies
  • Os series processors this is the last one after that Zos came into picture

Great listening. I am very much interested and from my favorite author “Born to Win (Made for Success Collection).

Author: Srini

Experienced software developer. Skills in Development, Coding, Testing and Debugging. Good Data analytic skills (Data Warehousing and BI). Also skills in Mainframe.