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User Viewpoint of System Organization of the PDP11
Representation of Information
13 other sections not shown
address space address value addressing mode ASCII assembler assembly language binary number BLKW byte CLR RO complement computer system Condition Codes COROUTINE CRTOUT data array data buffer register DATA POINTER DISPLAY ENDM example execution fetch follows format HALT hardware host program I/O device INC RO input instruction set interrupt request interrupt service routine interrupt vector JSR PC keyboard loaded longword LOOP machine code MACRO main memory MAIN PROGRAM Memory Map memory space memory word Mnemonic Mnemonic code MOV RO MOV SP MOVB Note octal Octal machine code offset operand operating system output PDP-11 system physical memory R1 MOV representation result shown in Figure sign bit specific stack memory starting address subroutine symbolic address system software TSTB updated PC virtual memory virtual memory system WRITE XX XX 00 XX XX XX zero