Accession Number:

AD0731658

Title:

The ISPL Machine: Principles of Operations

Descriptive Note:

Corporate Author:

RAND CORP SANTA MONICA CA

Personal Author(s):

Report Date:

1971-08-01

Pagination or Media Count:

36.0

Abstract:

The report is the first of a series conceptually describing the Incremental System Programming Language computing system, an integrated environment for multiuser research programming. The ISPL language and machine are jointly designed, with hardware providing the control and scheduling facilities traditionally handled by Job Control Language and other software. Close correspondence between program statements and machine actions makes for clarity and efficiency and facilitates incremental compilation, which in turn allows on-line, interactive programming and debugging. During postfix program translation, ISPL inserts NEW STATEMENT operators that define interruptible points. User address spaces are carefully segregated. Separately accessed memory areas are assigned in logical units, with pointers. Most programs and data remain in virtual memory only those portions of program and data actually referenced are contained in real memory. Resources are allocated by machine primitives called semaphores, which may also carry data.

Subject Categories:

  • Computer Programming and Software
  • Computer Hardware
  • Computer Systems

Distribution Statement:

APPROVED FOR PUBLIC RELEASE