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

By Derrick Morris

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The number In the ADDRESS REGISTER will be repeatedly Incremented to address successive store lines. Thus to load a program Into the store of the PDPll by means of the console facilities we proceed as follows . Step Step Step Step Step 2 3 4 5 Set on the SWITCH REGISTER the address of the store line Into which the first Instruction Is to be placed . Operate the LOAD ADDR key . Set on the SWITCH REGISTER an Instruction . Operate DEP. Repeat from Step 3 for each Instruction of the program. Having loaded a program In this way .

Thus. for example. mode 1 (the deferred form of mode 0) causes the number In the specified register to be used as the address of the operand In main store . It Is therefore similar to modes 2 and 4 but unlike them In that the register content Itself Is not altered. 3. 1. 4 Examples of the use of modes 1. 3. 5 and 7 The Initial values assumed In the examples given below are Rl = R2 = STORE STORE STORE STORE STORE 1000 1002 LINE LINE LINE LINE LINE 1000 1002 1004 1006 1008 = = = = = 100 1006 1008 -2 -1 The style of presentation of the examples below follows that of Section 3 .

And an overflow bit CV) which Is set only If the last result Is In error because of arithmetic overflow. 4 . -_1t_ CMP BIT BIC BIS ADD SUB CLR COM INC DEC ***- NOTES C cleared if result .. 0, otherwise set .. 1 ACe ***1 **** SWAB **00 no other action **1* V is cleared if N-e, otherwise set .. 1 **1* V is cleared if N-e, otherwise set .. 1 **1* V is cleared if N-e, otherwise set .. 1 **** **00 NEG sac TST ROR ROL ASR ASL 1t*** A closer Investigation of arithmetic overflow Is appropriate at this point.

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