Overview
This course introduces students to the basic skills required to write assembler programs using the IBM High Level Assembler (HLASM). The course introduces students to the concept and use of assembler languages. Students learn to use fixed point and decimal (packed) instructions to perform required programming functions. Among the topics to be covered will be:
- Character, packed and binary data instructions.
- Data editing and output control.
- Processing tables.
- Program linkage conventions.
- Data management macros.
- Assembler language debugging.
- Developing large programs using multiple base registers.
- Creating and using DSECTs.
Upon completion of the course, the students will be able to write High Level Assembler programs that read and write disk/tape files, and generate formatted reports. A series of written and lab exercises will be used to reinforce the classroom education. Students will code, assemble and execute a series of programs using fixed point and decimal instructions with instructor supplied JCL and test data.
Audience
Students should have taken an Introduction to z/OS or equivalent experience
TSO/ISPF or equivalent experience.
Basic MVS JCL or equivalent experience
Previous experience in designing and coding application programs will enhance the results of this course.
Length
40 hours
Outline
Introduction to Assembler
- Concept of Machine Language
- Purpose of the Assembler
- Machine Language and Assembler Language
- Coding Rules and Statement Formats
- Instruction Formats
Defining Storage Areas and Constants
- Define Storage (DS) statement
- Define Constant (DC) statement
- Types of Constants
- Definition of Input and Output Records
Packed Decimal Processing
- Arithmetic Instructions
- Comparison Instructions
- Conversion Instructions
- Data Movement Instructions
Assembling and Executing Your Program
- Assembler Language Control Statements
- Interpreting the Assembler Output
- Executing Your Assembler Program
- Dump Analysis
Conditional Processing
- Comparison Instructions
- Branching Instructions
Output Control
- Edit Instruction
- Edit and Mark Instruction
Binary Processing
- Data Loading/Storage
- Arithmetic Instructions
- Comparison Instructions
- Conversion Instructions
Table Processing
- Introduction
- Table Processing
- Loop Control
Program Linkage
- Program Entry Sequence
- Program Exit Sequence
Sequential File Processing
- Overview
- DCB Macro
- OPEN / CLOSE Macros
- GET / PUT Macros
Program Sectioning
- Multiple Base Registers
- CSECTs
- DSECTs