; ----------------------------------------------------------
; One of a series of sample PC-231 programs to print strings
; Version #2: prints a fixed string which is stored in the
; computer's RAM in a data section following the program.
; Uses a loop and halts with zero "character" at end of string.
;
; by Fritz Ruehr # CS 231 # Fall 1998

	DATA  #DONE	; address of end of program
	COPY  DR,J0	; set up J0 for the jump
	DATA  #STRING	; address of the data section
	COPY  DR,R0	; set up R0 for use in LOADs
	DATA  5		; put string length in DR
#NEXT
	LOAD  R1,R0	; get the next character from RAM
	JPIF  DR,EZ,J0	; skip to #done on 0 data
	WRITE R1,D2	; echo ASCII character to display
	INC   DR,-1	; decrement the string length
	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)

#STRING
	CONST 'H'
	CONST 'e'
	CONST 'l'
	CONST 'l'
	CONST 'o'

; --- End of print2 program ---