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+; MCU 8051 IDE - Demostration code
+; Compiler directives
+
+
+$DATE(32/13/1907)  	; Places date in page header   
+; $EJECT		; Places a form feed in listing
+; $INCLUDE(file.asm)	; Inserts file in source program 
+; $LIST			; Allows listing to be output
+; $NOLIST		; Stops outputting the listing 
+; $NOMOD		; No predefined symbols used
+$OBJECT(file.hex)	; Places object output in file
+; $NOOBJECT		; No object file is generated      
+$PAGING			; Break output listing into pages
+; $NOPAGING		; Print listing w/o page breaks    
+$PAGELENGTH(10)		; No. of lines on a listing page
+$PAGEWIDTH(20)	  	; No. of columns on a listing page
+$PRINT(file.lst)	; Places listing output in file
+; $NOPRINT		; Listing will not be output       
+; $SYMBOLS		; Append symbol table to listing
+; $NOSYMBOLS		; Symbol table will not be output  
+$TITLE('demo - 3')	; Places string in page header
+
+
+;; Summary of Cross Assembler Directives
+;; -------------------------------------
+
+a	EQU	54d	; Define symbol
+b0	DATA	a / 2	; Define internal memory symbol
+c	IDATA	(b0*2-5)	; Define indirectly addressed internal memory
+d	BIT	070Q	; Define internal bit memory symbol     
+e	CODE	0FFA5h	; Define program memory symbol
+var	SET	(A * 44) MOD 9 - 14 ; Variable defined by an expression
+
+	CSEG at 20h	; Select program memory space  
+x:	DB	'34'	; Store byte values in program memory    
+y:	DW	3334h	; Store word values in program memory 
+
+	DSEG at 5d	; Select internal memory data space
+m:	DS	1	; Reserve bytes of data memory
+
+	xseg		; Select external memory data space     
+n:	DS	1	; Reserve bytes of data memory
+
+	ISEG		; Select indirectly addressed internal memory space
+o:	DS	1	; Reserve bytes of data memory       
+
+	NOLIST	; Disable code listing
+	BSEG		; Select bit addressable memory space 
+r:	DBIT	4	; Reserve bits of bit memory
+	LIST	; Enable code listing
+
+
+mc	macro	label	; Define macro instruction
+	IF 2 <> 2 OR 1 = 4
+		EXITM	; Exit macro
+	ENDIF
+	sjmp	label
+endm			; End of definition
+
+main:	ORG	0	; Set segment location counter 
+	IF 0	; Begin conditional assembly block      
+		USING	2	; Select register bank (define AR0..7)
+	ELSE	; Alternative conditional assembly block 
+		USING	2	; Select register bank (define AR0..7)
+	ENDIF	; End conditional assembly block
+
+	mc	main	; Macro instuction
+
+	END	; End of assembly language source file
+
+
+; This is a very long line, try to avoid them. This is a very long line, try to avoid them. This is a very long line, try to avoid them. This is a very long line, try to avoid them. This is a very long line, try to avoid them. This is a very long line, try to avoid them. This is a very long line, try to avoid them.This is a very long line, try to avoid them. This is a very long line, try to avoid them.This is a very long line, try to avoid them. This is a very long line, try to avoid them. This is a very long line, try to avoid them. This is a very long line, try to avoid them.