ASO EXECUTIVE ROUTINE

A PILOT MO EL OF A REAL-TIME INFORMATION STORAGE AND RETRIEVAL SYSTEM WAS CONSTRUCTED. Several files are stored in a large, intermediate speed, random access storage device which is an IBM 1405 disk file. Associated with this file are trees hierarchical index files and various programs that are needed to retri v , o or d o upd e the information files. T HES AR LSO S ORE ON HE DISK. The method used to access the files by tracing one or more keys through the trees is the Multi-List technique. All information to and from the 1405 disk passes through an IBM 1401 processor which also does all of the actual processing. A diagram representing the system is given. O OF H IMPORT NT F ATURES IN HE SYSTEM IS THE DIVISION OF PROGRAMS INTO TWO PRIORITI S WITH THE ABILITY TO INTERRUPT A LOW PRIORITY PROGRAM WITH A HIGH PRIORITY ONE. The high priority is reserve for programs that provide immediate, low volume output in response to inquiries regarding the files. Certain features, originally planned for the Executive Routine, were omitted because of the limitations of the 1401 system availabl . In particular, he small memory 80 0 c aracter total, 2000 charac ers for the Execu iv Rou in i port nt factor. Some det ils of the originally proposed Execu ive Routine are appended. Author