Hi,

I have come across an exercise in a book whith the following problem.

Write a program that inputs charcters from the device attached to the 8051 serial port and echoes them back to the screen converting lowercase chars to uppercase.

My 8051 is attached to the PC and I communicate with it via Hper Terminal. I understood how to initialize the serial port and the following Inchar and Outchar subroutine were provided.

INCHAR : JNB RI,$ ;WAIT FOR CHAR
CLR RI ;CLEAR FLAG
MOV A, SBUF; READ CHAR INTO A
RET

OUTCHAR : CLR TI; CLEAR FLAG
MOV SBUF,A ; SEND LETTER TO PORT
AGAIN : JNB TI, AGAIN
RET

Can someone help me with the program?

Thanks
John