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

Sample text

The name of this addressing mode Is auto-Increment. Mode 4 has a strong similarity with mode 2 and as Its name. auto-decrement , Implies, It Is complementary to It . Like mode 2, the operand Is taken from the store line whose address Is given by the number In the specified register . The difference Is that the number In the specified register Is first decremented so as to refer to the previous store line. It will become apparent from the discussion of stacks, In Section 3. 5, that there Is a good reason for the register content being changed before It Is used to select an operand with auto-decrement.

Which Interprets the user Instruction set. LSI11 s are microprogrammed In this way and the microprogram Is contained In a read only memory Inaccessible to the user. Therefore. without Incurring any extra hardware cost. except possibly as a result of Increasing the size of the microprogram store . quite sophisticated control operations can be provided . In fact all the later models of PDP" are microprogrammed but some. such as the 11/40 . maintain control console compatibility with earlier models such as the "/20.

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 . Bootstrapping Is the term that has been traditionally used to describe the process of loading.

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