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

By Derrick Morris

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4 and 6 The actions of the Instructions. using modes O. 2. 4 and 6 given below. are explained In symbolic notation. and by their numeric effect. assuming that they are obeyed sequentially starting with the Initial values R1 = 1000 R2 = 2 STORE LINE 1000 = 2 STORE LINE 1002 = 10 -4 STORE LINE 1004 In the symbolic description the brackets T T will be used to denote the content of the store line whose address Is given by the expression Inside the brackets. If the access Implies an auto-Increment a '+' symbol will be written after the T.

1 Addressing Modes O. 2. 4 and 6 The odd numbered modes are systematic variants of the corresponding even numbered modes. and they are described later. Mode 0 Is called Reg/ster Mode. and In this case the number In the specified register is used as the operand. and of course replaced by the result In the case of Ad . Thus the Instruction An Introduction to System Programming - 26 0110 000 I I I I I I I I I I I I 011 I I 000 I Based on the PDP' 1 101 destination register =5 ------ destination mode = 0 (register mode) --------- source register = 3 ------------ source mode = 0 (register mode) ---------------- function = 6 (ADD> means add the number In register 3 to the number in register 5 and place the result In register 5 .

This Is best Ignored until the need arises . in practice many programs can be written which use only a subset of the PDP11 's functions and addressing modes . 29 The Structure of the PDP11 061132 [A1) +> [[A2)+) 066252 000004 063272 000000 [A2+4) +> [-[A2lJ [[A2]+] +> [[A2+0lJ [lO06) A2 <= A2 <= (1006) (1008) A2 <= <= 98 1004 1002 <= 97 <= 96 1004 Some explanation of the above might be helpful. Firstly the notation '+>' has been introduc ed to mean ' Is added into' since it avo ids having to specify the destination twice and it keeps the operands in the order in which the computer deals with them (as read left to right) .

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