Com 212 intro to system programming book Theory


in a lab as practical example



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com-212-introduction-to-system-programming-theory
9833 SS1 FISHERY LESSON NOTE
in a lab as practical example.






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PROGRAM EXAMPLE

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PURPOSE OF EXAMPLE PROGRAM

Reads records from input device (code F) Copies them to output device (code 05) At the end of the file, writes EOF on the output device, then RSUB to the operating system Data transfer (RD, WD) A buffer is used to store record. Buffering is necessary for different IO rates The end of each record is marked with a null character (00) 16 The end of the file is indicated by a zero- length record Subroutines (JSUB, RSUB) RDREC, WRREC Save link register first before nested jump

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WEEK FOUR
Learning outcome for this week The general format of an Assembly program statement The purpose of each field of Assembly language statement The meaning of symbolic operations, types of operations, program counter Registers, Instruction cycle Types of Instructions

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