Preface

This manual describes the use of the Precision Architecture RISC (PA-RISC) Assembler on HP 9000 computers.

You need to be familiar with the machine instructions to use the Assembler. For a complete description of the machine instruction set, refer to PA-RISC 1.1 Architecture and Instruction Set Reference Manual and PA-RISC 2.0 Architecture.

Note that, throughout this manual, there are references to PA-RISC 1.0, 1.1, and 2.0. Each version of the architecture is a superset of the preceding version.

Any program written for PA-RISC 1.0 machines will execute on PA-RISC 1.1 and 2.0 machines, but programs using instructions unique to PA-RISC 1.1 will not execute on PA-RISC 1.0 machines. Any program written for PA-RISC 1.1 machines will execute on PA-RISC 2.0 machines, but programs using features unique to PA-RISC 2.0 will not execute on PA-RISC 1.1 or 1.0 machines.