The amount of available memory on a particular machine will depend on the machine configuration including the amount of memory used by the operating system, memory used by any special device drivers, and any memory‑resident utility programs. Generally, a 640K PC with minimal memory overhead will have about 550 to 580K of RAM available for applications, such as the ISC models. The amount of available RAM can be determined by executing the DOS CHKDSK command. This is done by entering the command 'CHKDSK C:' to check the C: drive. Refer to the DOS manual for more information about CHKDSK.
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. This section 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.
4.1.2 Requirements for Execution on a DEC VAX Minicomputer
ISCST will run on any DEC VAX minicomputer or workstation which has enough main memory to do the real application run. More than 5 MBytes user disk space is recommended.
4.1.3 Requirements for Execution on an IBM Mainframe
ISCST will run on any IBM 3090 or above mainframe as long as the machine supports enough memory. The size of the desired memory depends on the size of the application case run. At least 5 MBytes user disk space is recommended.
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