Listing 2-The MAC address is also known as the physical address. The MAC and IP addresses are used to make NICs unique and repeatedly reachable on a network.

;
;******************************************************************
;*	HARDWARE (MAC) ADDRESS DEFINITION
;*	YOU MAY CHANGE THIS TO ANY VALID MAC ADDRESS
;*
;******************************************************************
#define	MYMAC0	0	;most significant octet of MAC address 
#define	MYMAC1	0
#define	MYMAC2	'E'
#define	MYMAC3	'D'
#define	MYMAC4	'T'
#define	MYMAC5	'P'	;least significant octet of MAC address
;******************************************************************
;*	INDIVIDUAL ADDRESS LAYOUT IN CS8900
;* MYMAC 5 4 3 2 1 0
;* CS REG |0X15D|0X15C|0X15B|0X15A|0X159|0X158|
;* | P | T | D | E | 0 | 0 | 
;******************************************************************
#define	MYMAC10	(MYMAC1 << 8 | MYMAC0)
#define	MYMAC32	(MYMAC3 << 8 | MYMAC2)
#define	MYMAC54	(MYMAC5 << 8 | MYMAC4)


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