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1 Introduction to Computing
2 Computer Components Data Formats and Addressing
3 Storage Allocation Assembly Process
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Assembler Format BALR base register binary number block branch instruction byte long bytes in length Channel Command Word character contains the address core DASD data area data records decimal number digit disk doubleword DS CL80 EBCDIC end-of-file entry error Example execution field contains FIGURE file label fixed-point FLDA FLDB fullword halfword hexadecimal hexadecimal number high-order I/O area index register indexed sequential file indicates IOCS ISAM length code Load location counter logical record low-order Machine OP Code macro instruction main storage mask bits master record Mnemonic OP Code module Name Oper Operand Note number of bytes number system optional overflow area parameter physical IOCS POINTR problem program processing Program Interruptions punched result routine second operand sequence shift sign bit source field statement stored subroutine Subtract symbolic name tape file track two's complement write zero