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Additional resources for An Introduction to System Programming — Based on the PDP11

Example text

The operand accessed as a result of using mode 6. Is the content of the store line whose address Is obtained by adding the number In the specified reg ister to the number In the next line of the program . Clearly the Control Unit must also cause an extra Increment to the program counter for each Instance of mode 6. to avoid these 'In-line' constants being subsequently treated as Instructions . The Structure of the PDP" 27 Before we consider examples of the use of the addressing modes. It Is necessary to note the way In which the store lines of a PDP11 are numbered .

And which he knows as the bootstrap sequence. In this book we are very much concerned with the hardware characteristics and system software structure. thus It Is Inappropriate to assume the existence of system software. A better starting point for our purposes Is a more primitive system equipped only with a simple means for reading from an external media containing programs . The simplest device which has been used In this connection Is a paper tape reader or a teleprinter with a paper tape reader/punch .

Tested and placed In the memories of the computer by means of the even more sophisticated computers which the manufacturers use for the development and production of software . An average user will treat the computer. together with these Inbullt programs (systems software) . as an Integrated system. and will never need to know about the underlying hardware characteristics or the system software structure. He will usually execute a simple sequence of switch operations at the time the computer Is powered up.

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