AUDIENCE:   New System Programmers, Technical Support and Software Programmers and Application Programmers who need the ability to write and debug Assembler Language programs and better understand the software that their installation uses. PREREQUISITES:   Knowledge of the internal organization and operation of the system/370 series including 43xx and 30xx machines and hexadecimal arithmetic is recommended. Previous Programming experience recommended. DURATION:   4 Days APPROACH:   This class is taught by lecture with hands-on workshops OBJECTIVES:   After completing this course students should be able to: Develop a better understanding of the machine and how it processes instructions. Develop the skills to write assembler programs, particularly those small functions which will increase efficiency of their corporation's computing throughput. Gain a practical introduction to the essential operating system interfaces with Assembler. Enhance their diagnostic skills. Improve their dump analysis skills. COURSE CONTENT:   CONTROL SECTION Source Code Definitions; Object Modules, and Load Modules Control Section Definition START Command Definition CSECT Command Definition Setting up Addressability in a Control Section USING Statement BASR Instruction (Branch and Save Register) Multiple Base Register Specifications MVC Move Character Instruction LA Load Address Instruction Symbolic Address Base Addressing Displacement Calculations Index Addressability MVS Move Immediate LITERALS EQUATES DATA DEFINITIONS Define Constant Binary Characters Hexadecimal Fixed Point Addressing Operand Subfields, Length Attributes, Constant Alignment, Padding, Types, Duplication Factor Expressions, Bit length Modifier, Y CONS, A CONS, V CONS Define Storage INSTRUCTION SET CLC: Compare Logical Character B: Branch Instruction Format CLI: Compare Logical Integer STM: Storage Multiple IC: Insert Character STC: Store Character L: Load LH: Load Halfword LR: Load Register SH: Subtract Halfword ST: Store LTR: Load and Test DSECT: Dummy Section How to Define a Dummy Section. What a Dummy Section Is. How to Use a Dummy Section. DAY 1 WORKSHOP Read Card Input Until Last Card, then Output Cards OS/390: I/O Needs DOS: I/O Needs C: Compare Function CH: Compare Halfword CR: Compare Register BCT: Branch on Count BCTR: Branch on Count Register BAL: Branch and Link BINARY CONVERSION PACK: Pack CVB: Convert to Binary CVD: Convert to Decimal UNPK: Unpack BINARY ARITHMETIC AR: Add Register A: Add Instruction AH: Add Halfword SR: Subtract Register SH: Subtract Halfword MH: Multiply Halfword M: Multiply D: Divide DR: Divide Register DAY 2 WORKSHOP Sort Data Using A Bubble Sort DECIMAL ARITHMETIC AP: Add Decimal CP: Compare Decimal DP: Divide Decimal ED: Edit EDMK: Edit and Mark MP: Multiply Decimal SRP: Shift and Round Decimal SP: Subtract Decimal ZAP: Zero and ADD DAY 3 WORKSHOP Binary Arithmetic LINKAGE INSTRUCTIONS BAS/BASR: Branch and Save Register DAY 4 WORKSHOP Packed Arithmetic