;Sending letter "A" to HyperTerminal (or TeraTerminal) via Serial 1 (2nd COM port next slide Sw) on MDE 8051 Trainer
;Tested by M. Mazidi 
;Modified from Example 10-11 in "The 8051 Microcontroller" textbook by Mazidis & McKinlay 
;Download the program by putting the slide SW on PROG 
;After the download is completed: 
;a) disconnect the power, 
;b) disconnect the serial cable from Serial 0 DB-9 and connect it to serial 1 DB-9
;c) Make sure to put a jumper on S2 (next to Power LED) to connect the TXD  
;d) Reconnect the power 
;put the slide SW on RUN and Reset the board and you will see letter 'A' will appear on screen
;Notice the Serial 0 COM port is the one used to download the program to MDE 8051 Trainer
;and Serial 1 (2nd cOM port used in this example) is next to the slide SW for PROG/RUN
 			
 			SBUF1	 EQU 0C1H	;the addresses for 2nd serial (serial 1) port	
			SCON1	 EQU 0C0H		
  			TI1	 BIT 0C1H		
			RI1	 BIT 0C0H
		
			ORG	 0H			
MAIN:
			MOV	 TMOD,#20H		
			MOV	 TH1,#-3			;notice -3 gives 9600 baud rate		
			MOV	 SCON1,#50H	
			SETB	 TR1			
AGAIN:			MOV	 A,#'A'		
			ACALL	 SENDCOM2
			SJMP	 AGAIN
;--------------------sending data via the 2nd serial port 			
SENDCOM2:
			MOV	 SBUF1,A		
HERE:			JNB	 TI1,HERE		
     			CLR	 TI1
     			RET
;------------------------
			END