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PROGRAM STRUCTURE 58
7O Recursive Subroutines 72 The System Stack
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ADDB addressing mode argument ASCII code assembler language binary bit l5 block branch instruction breakpoint character clear condition codes console emulator contains contents of R1 decimal deﬁned destination digit directive disk encode EVAL example EXERCISES ﬁeld ﬁle ﬁnd ﬁrst word ﬂoating point handler hardware increment input interrupt request interrupt service routine label linking loader loaded loop low byte main program memory location memory management memory word monitor call MOVB Note octal operand operating system output PDP-ll perform pointer printer buffer printout routine priority reference referenced relocatable relocation RT-ll Section sector sequence set/clr by result space speciﬁed stack status register stored subroutine Suppose symbol system macros terminal keyboard terminal printer trap TTYOUT UNIBUS virtual address Write a program