Derrick Morris's An Introduction to System Programming — Based on the PDP11 PDF
By Derrick Morris
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Extra resources for An Introduction to System Programming — Based on the PDP11
Are treated specially. and in particular addresses 177700 to 177707 octal correspond to registers 0 to 7 . There Is a departure here from the normal addressing rules because the registers. which are 16 bits long. have consecutive rather than even addresses. The reg isters can only be accessed In this way from the console. not by program . 2 SWITCH REGISTER to 177707 the LOAD ADDR key SWITCH REGISTER to 002000 the DEP key MANUAL OPERATION OF AN LSlll The LSI types of PDP11 present an apparent contradiction.
At this stage of the bootstrap It Is often expedient to write the program to read In the symbolic programs (called an assembler) . In Its own language (called assembly language). It has then to be translated Into octal before It can be used . but the assembly language version forms a useful test program . Obviously when the assembler. written In assembly language. can again read Itself. It Is working fairly satisfactorily. Furthermore. If any changes need to be made . they can be more easily made to the assembly language version .
For example It would be possible to have an Instruction lZ] <=[X]+[y] meaning add the contents of the store lines whose addresses are given by X and Y, and place the result in the store line whose address is given by Z. However, this would Impose a requirement for the Instruction format to accommodate three addresses . On a 16-blt computer this Is not practicable and the PDPll uses a 'two address format' . In this case the result replaces one of the two operands, thus the general form of Instruction is lX]<=[X]+[Y] .
An Introduction to System Programming — Based on the PDP11 by Derrick Morris