; -------------------------------------------------------
; A sample PC-231 program to print a string stored in RAM
;
; by Fritz Ruehr # CS 231 # Fall 1998
; -------------------------------------------------------

    DATA  #done ; address of end of program
    COPY  DR,J0 ; set up J0 for the jump

    DATA  #data ; address of the data section
    COPY  DR,R0 ; set up R0 for use in LOADs
#next
    Load  r1,r0 ; get the next character from RAM

    JPIF  r1,ez,J0  ; skip to #done on 0 data

    WRITE R1,D2 ; echo ASCII character to display
    INC  R0,1   ; point to the next RAM character

    JUMP  #next ; repeat the LOAD/WRITE cycle
#done
    HALT        ; end of program

; ---------------------------------------
; Data section (the string to be printed)

#data
    CONST 'H'
    CONST 'e'
    CONST 'l'
    CONST 'l'
    CONST 'o'
    CONST ' '
    CONST 't'
    CONST 'h'
    CONST 'e'
    CONST 'r'
    CONST 'e'
    CONST '!'

; --- End of printer program ---