Assembler Language Programming: The IBM System/370 Family
Introduction to computer structure: the IBM system/370; Introduction to IBM system/270 machine language; Introduction to assembler language; Information move and binary integer arithmetic; Writing a complete program; Conversion and subroutines.
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1A Representation of Information
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alignment arithmetic arithmetic shift assembler language BALR binary integer bit positions block BXLE called cell channel Chapter character condition code constant contains contents of register data control block data item data set DD statement debugging decimal number defined derived key displacement dump EBCDIC ENDIF example execution field FIGURE floating-point numbers full word half-word hexadecimal IBM System/370 index register input and output interrupt job control length loaded logical loop low-order machine language macro instruction main storage main storage locations move multiplication NEXTSTEP operand address operating system overflow packed decimal parameters program segment program status word pseudo-code record register 9 register pair register Rl relocatable representation result second operand sequence shown in Fig specified stored string struction structure subroutine Subtract supervisor symbol terminal tion user's program XDECI XREAD XRETURN zero