Assembler Language Coding Workshop - ES34G

Assembler Language Coding Workshop - ES34G


This course is designed for application programmers and/or beginning system programmers who code, maintain and/or debug application support programs or subroutines written in S/370 or S/390 Assembler Language.


There are no prerequisites for this course.


5 days.

Course Objectives

This classroom hands-on lab course provides an introduction to the mainframe Assembler language. The course is designed to develop the skills appropriate to write and/or maintain programs and routines written in S/370 or S/390 Assembler Language. Emphasis is placed on enhancing skills in problem resolution through program check interruption analysis and dump reading.

  • Recognize architectural features, such as instruction formats, data representation, storage addressing, and so on, which are significant to program analysis
  • Identify point of program interruption, using the formatted system dump and elements of information such as the Program Status Word (PSW), the Instruction Length Code (ILC), the program's base register(s), and so on
  • Identify appropriate standards for assembler programs in terms of program organization, register conventions, coding practices, documentation, and so on
  • Code and debug assembler language programs which:
  • Conform to standard linkage conventions using save area chaining
  • Define and use various types of data definitions, including fixed point binary, character, hexadecimal, and packed decimal
  • Employ standard macros such as CALL, SAVE, RETURN
  • Use various Assembler Language statements such as CSECT, EQU, COPY, END
  • Use both symbolic and explicit notational forms for instructions
  • Use data literals appropriately, and explain the use of LTORG to direct positioning of the literal pool
  • Create and use appropriate patterns for EDIT instructions

Course Content

Day 1
Unit 1 - Numbering systems
Unit 2 - Mainframe architecture
Unit 3 - Assembler syntax
Overview of instructions: LA, LR, LTR, MVC, DS, DC
Exercise 1 - 80/80 listing
Exercise 1A - 80/80 listing

Day 2
Exercise 1 review
Unit 4 - Data definition statements
Unit 5 - Fixed-point binary instructions
Exercise 2 - Binary data

Day 3
Exercise 2 review
Unit 6 - Addressing, comparing, and branching
Unit 7 - Data movement instructions
Exercise 3 - Text handling

Day 4
Exercise 3 review
Unit 8 - Assembler pseudo instructions
Unit 9 - Reading dumps
Unit 10 - Packed decimal processing
Exercise 4 - Packed data/editing

Day 5
Exercise 4 review
Unit 11 - Miscellaneous instructions

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