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Design of an integrated programming and operating system, Part II: The assembly program and its language

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In the past few years, programming methods in general use have tended to emphasize modularity of program design; not only for large, complex programs, but even for those of relatively modest size. A common method for achieving modularity has been to divide the program into (relocatable) segments, because: • Coding and checkout of the individual segments can proceed in parallel, thereby considerably reducing the time between analysis of the problem and availability of a running program. • Modifications to the program, which are usually confined to a few segments, can be accomplished without the necessity of reassembling the entire program. • Duplication of effort can be minimized by taking advantage of libraries of previously checked-out subroutines. Different programming techniques can be used for the various segments, thus allowing the exploitation of the strong points of a particular language or processor.

Note: The Institute of Electrical and Electronics Engineers, Incorporated is distributing this Article with permission of the International Business Machines Corporation (IBM) who is the exclusive owner. The recipient of this Article may not assign, sublicense, lease, rent or otherwise transfer, reproduce, prepare derivative works, publicly display or perform, or distribute the Article.  

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IBM Systems Journal  (Volume:2 ,  Issue: 2 )