The lan@~age which it accepts, ABACUS/X, is described, as is overall system operation. The internal workings of the compiler are discussed, along with the methods developed to minimize the memory space problems inherent in the use of incremental compilers. Speed and space comparisons are included for some benchmark programs. Abstract A LITTLE I M P L E ~ T A T i O N LANGUAGE P. J. Plauger YOURDON Inc. A language is described that was implemented on a PDP-11 computer for writing system-level code for the PDP-I] family of minicomputers. The little implementation language LIL offers a number of features that facilitate writing structured, high-level code with no sacrifice in efficienc2 over assembly language. The discussion ends with a harsh evaluation of its future usefulness. TOMAL - A HIGH-LEVEL PROGRAMMING LANGUAGE FOR MICROPROCESSOR PROCESS CONTROL APPLICATIONS R. B. Kieburtz and J. L. Hennessy Department of Computer Science State University of New York at Stony Brook ON A TRANSPORTABLE HIGH LEVEL LANGUAGE FOR M I N I C O M P U T E R S Abstract This paper describes the multi-tasking capabilities of a new microprocessor programming language that has been designed to support process control applications. A program in TOMAL is a collection of tasks, priority ordered, and possibly having real-time response constraints and internal synchronization statements. It also supports device-independent I/O programming, by allowing the characteristics of each external device to be given in a declaration. A TOMAL source program is translated into space-optimized, absolute code for a target microprocessor. The object program runs under the control of a compact, applicationtailored Task Control Monitor that is also generated by the compiler. The paper discusses design philosophy and several important requirements of an implementation to achieve multi-tasking capabilities. A. Ian Stocks and Jayant Krishnaswamy Department of Computer Science University of Illinois at Urbana-Champaign Urbana, Illinois Abstract This paper describes a high-level, PASCALbased language, which is easily implementable on minicomputers with limited amounts of memory. The added features include a machine and operating system~independent formalism for describing file structures, and allow either compile time or runtime specification of the actual-formal file correspondence. A similar formalism for handling program overlays is described. These constructs are implemented in a manner consistent with the underlying language PASCAL, and allow one to easily write operating systems components. - 10-
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