10. Serial communication between two 8085 through RS-232 C port.

Program for the transmitting microprocessor: 

ORG 0000h  ; Starting address of the program       

; Initialize the serial port

MOV A, 80h  ; Load control word for serial port into A

OUT 01h    ; Send control word to serial port

; Send data through serial port

MOV A, data  ; Load data to be sent into A

OUT 02h     ; Send data to serial port

; End of program

Program for the receiving microprocessor:

ORG 0000h  ; Starting address of the program

; Initialize the serial port

MOV A, 80h  ; Load control word for serial port into A

OUT 01h    ; Send control word to serial port

; Receive data from serial port

IN  A, 02h  ; Receive data from serial port into A

; Process received data

; ...

; End of program