By Derrick Morris
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Additional info for An Introduction to System Programming — Based on the PDP11
Usually the Operation and Bootstrapping 51 user will take control at this point and manually start the program. If. however. there are further Instructions to be read a new tape can be placed In the reader and operation of CONT (or typing P) will restart the loader . Thus . a simple program written for the loader will have the form t address of the first Instruction (In octal> first Instruction (In octal> second Instruction (In octal> last Instruction (In octal> t Although the norm will be for each octal number to appear on a separate line.
4 to which the following key applies 0 1 • ? 5 means means means means means always set to zero always set to one not changed set conditionally as stated above set conditionally as specified Explicit Setting of Condition Codes A significant number of the FO functions (the rest are given In Appendix 1) are provided specifically to allow Individual condition codes to be set. They have no other effect. 5 summarises their action . 3 OCTAL CODE ACTION 000241 000242 000244 000250 000261 000262 000264 000270 CLEAR CLEAR CLEAR CLEAR SET C SET V SET Z SET N C V Z N MNEK>NIC CLC ON CLZ CLN SEC SEV SEZ SEN BRANCH INSTRUCTIONS The format of the branch Instructions In the PDPll Is quite different from that of other types of Instructions .
With yet another format. In which 42 An Introduction to System Programming - Based on the PDP11 the 7 could be any register R. say . Its complete action Is PC <= the va lue of register R register R <= -[SP). That Is the specified register Is copied to PC. and the register Is then reset from the stack. It Is. therefore . necessary to advance the register R to the first Instruction after the 'Inllne' parameters If the facility to store parameters after the JSR Instruction Is exploited. This can sometimes be achieved by using auto-Increment at the time of accessing the parameters.
An Introduction to System Programming — Based on the PDP11 by Derrick Morris