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The IBM System360
Subsystems of a storedprogram digital computer
Structure of the IBM System360
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arithmetic arithmetic shift assembler language BALR binary integer bit positions blank buffer bytes cell Chapter characters condition code constant contains contents of register data control block data item data set DCB macro-instruction DD statement ddname decimal number defined device displacement EBCDIC example execution floating-point numbers floating-point register FPR1 full word half-word hexadecimal high-order IBM System/360 IBM System/360 Operating implied base register index register input and output interrupt job control language loaded logical loop low-order machine-language macro magnetic tape main storage main storage location move multiplication operand address operating system overflow packed decimal parameters program segment program status word record register 13 register 9 register Rl relocatable representation result second operand sequence shift instructions shown in Fig specified stored string subroutine subtraction supervisor symbol test for exit tion user's program zero