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The first of a series conceptually describing the Incremental System Programming Language (ISPL) 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 online, 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. Data semaphores compose Ports, which provide hardware/software/user communications (described in R-605). (See also R-563, R-603, R-622, RM-5611.)

This report is part of the RAND Corporation report series. The report was a product of the RAND Corporation from 1948 to 1993 that represented the principal publication documenting and transmitting RAND's major research findings and final research.

The RAND Corporation is a nonprofit institution that helps improve policy and decisionmaking through research and analysis. RAND's publications do not necessarily reflect the opinions of its research clients and sponsors.