Journal of Formalized Mathematics
Volume 11, 1999
University of Bialystok
Copyright (c) 1999 Association of Mizar Users

## The SCMPDS Computer and the Basic Semantics of its Instructions

Jing-Chao Chen
Shanghai Jiaotong University

### Summary.

The article defines the SCMPDS computer and its instructions. The SCMPDS computer consists of such instructions as conventional arithmetic, ``goto'', ``return'' and ``save instruction-counter'' (``saveIC'' for short). The address used in the ``goto'' instruction is an offset value rather than a pointer in the standard sense. Thus, we don't define halting instruction directly but define it by ``goto 0'' instruction. The ``saveIC'' and ``return'' equal almost call and return statements in the usual high programming language. Theoretically, the SCMPDS computer can implement all algorithms described by the usual high programming language including recursive routine. In addition, we describe the execution semantics and halting properties of each instruction.

This work was done while the author visited Shinshu University March--April 1999.

#### MML Identifier: SCMPDS_2

The terminology and notation used in this paper have been introduced in the following articles [16] [15] [22] [2] [18] [5] [6] [20] [1] [17] [7] [3] [13] [23] [8] [10] [4] [11] [12] [9] [19] [21] [14]

#### Contents (PDF format)

1. The SCMPDS Computer
2. The Memory Structure
3. The Instruction Structure
4. Execution Semantics of the SCMPDS instructions

#### Acknowledgments

We wish to thank Prof. Y. Nakamura for many helpful suggestions.

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