ISIM - A Simulation Language for Microcomputers

Article Abstract:

ISIM is a new simulation language for both 8- and 16- bit microcomputers. It is derived from the interactive simulation language ISIS which has been installed on a variety of minicomputers and mainframes over the past few years. ISIM can run on a small 8-bit microcomputer with the CP-M operating system, 48K bytes of memory and floppy disks. It also runs on the larger 16-bit computers operating under CP-M 86 or MS-DOS, and on the IBM PC operating under PC-DOS. Its interactive graphic capability is best exploited using a graphics terminal or the the microcomputer's integral graphics display (e.g., IBM PC Graphics Adapter). The language features interactive 'command' and 'program' modes and incorporates a simple editor and a file handling facility which is fully compatible with the operating system. ISIM provides a comprehensive, highly interactive, simulation environment which allows the user full control of the simulation. These features allow the simulation to be interrupted to enable the user to display or modify values of all user variables, change integration control variables, or perform post-mortem plots before proceeding with the execution of the run. (Reprinted by Permission of Publisher.)

Computer graphics, Interactive Systems, User Interface, User interfaces (Computers), Simulation Languages

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Real-Time Simulation Using Multiple Microcomputers

Article Abstract:

Advances in semiconductor technology have created integrated circuits with CPU's and larger memories that can accomodate many functions and programs. Using several of these microprocessors can increase throughput in real-time simulation. Five microcomputers were used in a simulation of a spark-ignited internal combustion engine. The system was decomposed, and tasks were assigned to the five microcomputers. Memory was shared. Simulation of the uncontrolled engine produced results comparable to actual engine performance. Flow charts and diagrams of the system and models, a graph of engine performance variables, and several results tables are presented.

Automobile industry, Motor vehicles, Engines, Real time systems, Multiprocessing, Models, Real-Time System

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Monte Carlo simulation on microcomputers

Article Abstract:

Monte Carlo analysis is a practical technique for including the effects of uncertainty in a model intended for decision support. It has been infrequently used, however, perhaps because it has been tedious and boring to do. A recently available software add-in to 1-2-3 named (at)Risk makes Monte Carlo analysis much easier. This paper demonstrates Monte Carlo analysis in spreadsheet simulation in 1-2-3 so that you are better able to judge whether or not you should employ it. (Reprinted by permission of the publisher.)

Prepackaged software, Usage, Decision support systems, Technical, Uncertainty, Spreadsheet software, Decision Support Software, Monte Carlo Methods, Risk Analysis, Add-In/On Software, Plug-in software, Lotus 1-2-3 (Spreadsheet software), atRisk (Add-in/on software)

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