An Introduction to System Programming — Based on the PDP11 by Derrick Morris

By Derrick Morris

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Extra info for An Introduction to System Programming — Based on the PDP11

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Obviously when the assembler. written In assembly language. can again read Itself. It Is working fairly satisfactorily. Furthermore. If any changes need to be made . they can be more easily made to the assembly language version . This bootstrap Is summarised as follows : Write the loader In octal. Key In the loader. Write the assembler In assembly language . Translate the assembler Into octal. Use the loader to read the assembler. Use the assembler to read an assembly language version of Itself.

Mode 2 with PC simply causes an operand to be selected from the store line whose address Is given by PC and PC Is Incremented by 2. However. when an Instruction containing this model register combination Is being executed . PC Is the address of the next 'Instruction' which Is therefore treated as a constant. Consider. for example. the Instruction 062702 000005 which achieves the action R2 <= R2 + 5 and Is In effect a 32-blt Instruction . This mode with PC Is called Immediate mode. Mode 3 with PC again results In what Is In effect an extended Instruction.

1. 6 Address modes 2. 3. 6 and 7 with PC Any addressing mode can be used with PC . the program counter . but the effects of using 2 . 3. 6 and 7 with PC are the most Interesting and are given special names . The other modes are rarely. If ever. used with PC. Mode 2 with PC simply causes an operand to be selected from the store line whose address Is given by PC and PC Is Incremented by 2. However. when an Instruction containing this model register combination Is being executed . PC Is the address of the next 'Instruction' which Is therefore treated as a constant.

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