Exercise 6.4-1    Pag 160


  ;;	Space.asm-A procedure which takes as input an integer in ax and displays that number of space characters on the CRT screen.
  ;;	If ax <= 0, no spaces are displayed. All registers are preserved.
  ;;

INCLUDE		PCMAC.INC
		.MODEL SMALL
		.586

		.CODE	;   No.   .DATA required
		.PUBLIC     space
Space		PROC
		push	ax
		push	cx
		push	dx   ;		_PutCh destroys ax and dx
		cmp	ax,   0
		jle	Done
		mov	cx,    ax
SpaceLoop:
		_PutCh         '   '
		dec	cx
		jnz	SpaceLoop
Done:	
		pop	dx
		pop	cx
		pop	ax
		ret
Space		ENDP
		END