1. NAME AND TITLE
FBSAM: User-Storage--Magnetic Disk Data Manipulator.
Oak Ridge National Laboratory, Oak Ridge, Tennessee.
3. CODING LANGUAGE AND COMPUTER
Fortran IV and Assembler Language; IBM 360/370.
4. NATURE OF PROBLEM SOLVED
FBSAM provides rapid movement of large blocks of data directly between user storage arrays and magnetic disk data sets. No buffer space is required. Large reductions in data transmission time and number of I/O requests can be obtained. Moves can be concurrent with each other and with computation.
FBSAM is intended for use by Fortran programmers with little or no Assembler Language
5. METHOD OF SOLUTION
FBSAM contains a number of entries which check for errors and invoke various Assembler
Language packages. The status data for a given data set are compacted into a single array. A form of
random access is available. A powerful note-point method of random write and retrieval is available.
The use of three concurrent functions eliminates the real time associated with data transmission tasks
by allowing them to proceed concurrently with other tasks.
6. RESTRICTIONS OR LIMITATIONS
Data to be moved must be stored in contiguous locations and no Fortran FORMAT facility is
allowed. The data sets produced are not compatible with normal Fortran I/O. Best efficiency is
obtained using long logical records. The speed is slightly better than that using track overflow with
Fortran sequential operations. Because chaining is used, secondary allocations of disk space are not
7. TYPICAL RUNNING TIME
The CPU time is negligible. Large logical records are transferred at the full disk rotation speed
without a rotational delay between blocks.
8. COMPUTER HARDWARE REQUIREMENTS
FBSAM is operable on the IBM 360/370 computers.
9. COMPUTER SOFTWARE REQUIREMENTS
Fortran IV and Assembler Language compilers are required.
W. A. Rhoades, "The FBSAM Data Transmission Package for IBM 360/370 Computers," ORNL-TM-5199 (January 1976).
11. CONTENTS OF CODE PACKAGE
Included are the referenced document and one (1.2MB) DOS diskette which contains the source
12. DATE OF ABSTRACT
KEYWORD: DATA PROCESSING, UTILITY