What is a Job Entry Subsystem (JES)

The Job Entry Subsystem (JES) manages jobs within an z/OS system. This article discusses the various stages in the lifecycle of a job.

Hercules/MVS Turnkey - MVS on a PC

I started my career as an operations analyst. Worked my way up to be a systems programmer for MVS. During my career as a systems programmer, I wrote several assembler programs on MVS. Those were interesting days and nights.

I was actually surprised to know that I can install MVS on my PC. The same version of MVS I supported - MVS 3.8! I know, it's not state of the art. It's just 24 bit addressing! But I think it is a good tool if one wishes to learn about operating systems in general and MVS in particular. Or if one just wants to relive old glory days in writing assembler code.

Types of Mainframe Processing: Batch and Online

There are two types of mainframe processes:

1. Batch Processing
2. Online Transaction Processing