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     For particularly large applications, involving a large number of sources, source groups, receptors and averaging periods, the user may find that the 640K RAM limit available  with DOS is not enough.  In addition to the DOS executable versions of the models, extended memory versions are available for use on 80386, 80486 or higher PCs with at least 8 MB of RAM for the ISCST model and at least 4 MB of RAM for the ISCLT model. The extended memory versions of the models were developed using the Lahey F77L/EM-32 Fortran Compiler (Version 5.2), and also require a math co-processor to be present.  For larger application scenarios, a Lahey-compiled ISCST executable and 8 MB of RAM are recommended.  Section 4.2.2 of this volume of the ISC User's Guide contains information on increasing the capacity of the model and setting it up to run on systems (with 80386 processors and higher) that make use of extended memory beyond the 640K limit of DOS.  There are special requirements for the operating system and Fortran language compiler needed to utilize the extended memory on these machines.

1.2.3.2 DEC VAX Requirements.

     The models have also been uploaded and tested on a DEC VAX minicomputer.  As with the IBM 3090, the VAX has some advantages of speed and greater memory capacity over the PC environment.  There are no particular hardware requirements for running the models on the VAX.  The user must be familiar with the operating system and Fortran language compiler being utilized on the VAX in order to properly setup and run the model and control the input and output files.  Instructions for setting up and running the models on the DEC VAX are included in this volume and in more detail in Volume III of the User's Guide.

 

 

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