›› Learning to code mainframe Assembler in more than 21 days

Mainframe assembler is still very much used in large cooperations today but the people who know assembler is shrinking. This is mostly because young people want to work in GUI environments and assembler is perceived to be hard. It is definitely at a lower lever than the languages taught at most collages but it does not need to be hard.

This site will provide a introduction to assembler programming for people thinking about getting there toes wet. For the more seasoned person with the fading memory I hope to provide a place where you can quickly come to get reference information and maybe a sample you can quickly put to work.

In an attempt to not leave our friends the COBOL developers feeling left out I will try and add some COBOL cross reference information to appropriate sections of this assembler tutorial. This should allow COBOL developers to relate to how instructions function is a way they are use to developing.

This site will only scratch the surface to assembler programming. The absolute go-to place to get all the answers is in a manual published by IBM called z/Architecture Principles of Operation. Every instruction in the z/Architecture is documented in this book and if you are serious about coding assembler you will have to download a copy for yourself. This link will do a Google search for you and provide a link where you can download the manual.