Programs in Physics & Physical Chemistry
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|Manuscript Title: Design and implementation of a word addressable data set for DEC-10 computers.|
|Authors: B.C. Karp, J.R. Comfort|
|Program title: WORD ADDRESSABLE DATA SET|
|Catalogue identifier: AAQS_v1_0|
Distribution format: gz
|Journal reference: Comput. Phys. Commun. 23(1981)355|
|Programming language: MACRO.|
|Operating system: TOPS-10.|
|RAM: 1K words|
|Word size: 36|
|Keywords: General purpose, Utility, Word addressable Data sets, Disk organization, Random/sequential i/0, File structures.|
Nature of problem:
It is convenient to have available a Fortran-callable subroutine package to perform random access I/O to or from an external device. I/O should be as efficient as possible and still provide flexiblility in accessing information.
For DEC-10 computers, a subroutine package implements a word addressable data set (WADS) concept. Design and implementation has been guided by the organization of the WADS available on CDC computers through the CDC Record Manager Package.
User's programs must allocate a 20 word "file information table" (FIT). More than one data set may be open simultaneously, but a separate FIT is required for each. Data sets are limited in length to about 2**25 words.
The subroutine package allocates a software I/O channel and core for an I/O buffer from the DEC Fortran-10 I/O package FOROTS.
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