---
title: "Os390 Vs Zos Top Differences"
description: "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 definite..."
url: https://srinimf.com/2012/03/25/os390-and-zos-differenec/
date: 2012-03-25
modified: 2026-10-10
author: "Srini"
categories: ["ZOS"]
tags: ["Os390", "ZOs"]
type: post
lang: en
---

# 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.

Related[10 Techniques to Keep Ahead of Your Competition](https://srinimf.com/2015/01/06/10-techniques-to-keep-ahead-of-your-competition/)

ZOs:

- 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

OS390

- 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)](http://www.amazon.com/gp/product/1455120367/ref=as_li_tf_tl?ie=UTF8&tag=mainframesrin-20&linkCode=as2&camp=1789&creative=9325&creativeASIN=1455120367)“![](http://www.assoc-amazon.com/e/ir?t=mainframesrin-20&l=as2&o=1&a=1455120367).

Related[Zo/s Storage Management?](https://srinimf.com/2012/10/23/zos-storage-management/)

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