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A Simple Hypothetical Computer
MachineLanguage Programming for a Real Computer
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16 bits addressing modes arithmetic array ASCII ASCII code ASCIZ assembler assembly language auto-increment binary numbers BLKW branch instructions byte calculator called CC bits character CMPB condition code conditional branch control unit copy decimal device digit disk effective address encoded ENDM error execution fetch fetch-execute cycle floating-point HALT hardware high level languages input integer interrupt interrupt request invocation KCSR KDBR label linker loaded LOOP machine-language program macro definition MCALL memory address memory locations MOV MOV MOVB negative octal offset opcode operand operating system output overflow paper tape parity parity bit PDP-11 instruction pointer problem representation result RTS PC shown in figure signed numbers source module subroutine subtract symbolic system stack terminal two's-complement unsigned update word write zero