| ABSTRACT | .... 2 | |
| 1 | Introduction | .... 3 |
| 2 | What is a Machine Architecture for Inference? | .... 4 |
| 2.1 | Unification | .... 4 |
| 2.2 | Backtracking | .... 5 |
| 3 | PSI Design Objectives | .... 5 |
| 3.1 | Requirements as a Tool | .... 5 |
| 3.2 | Requirements as an Experimental Machine | .... 7 |
| 4 | Machine Language | .... 9 |
| 4.1 | KL0 | .... 9 |
| 4.2 | Machine Instruction Level | .... 10 |
| 5 | Interpretation of KL0 | .... 11 |
| 5.1 | Stack Oriented Interpretation | .... 11 |
| 5.2 | Structure Sharing | .... 13 |
| 6 | Internal Data Representation | .... 15 |
| 6.1 | Data Representation | .... 15 |
| 6.2 | Clause Representation | .... 17 |
| 7 | Addressing Mechanism | .... 20 |
| 7.1 | Area Based Logical Addressing | .... 20 |
| 7.2 | Address Translation | .... 22 |
| 8 | Conclusion | .... 23 |
| Acknowledgements | .... 23 | |
| Reference | .... 24 |
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