Write a program using the XLAT instruction that will read a letter from the keyb

Question

Write a program using the XLAT instruction that will read a letter from the keyboard mat is one of the first 9 letters (a through i) and will output a number 1 through 9 output the number 1 if it is the letter a, output the letter 2 if it is the letter b, etc. Results: Explain how the program works. Reference for reading from the keyboard. A program to get a character from the keyboard (without testing 4 a character is ready) and place that character in location 400 is as follows: Reference for writing to the screen.

Explanation / Answer

START   SUB AH,AH   //CLEAR AH; TO GET INPUT FROM KEYBOARD
   INT 16H       // INTERUPT TO GET INPUT FROM KEYBOARD
   AND AL,F0H   // MASKING THE HIGHER NIBBLES OF AL
   MOV DL,AL    // MOVING THE CHARCATER TO DL FROM WHICH THE CONSOLE WILL PRINT
   JZ START   // IF THE INPUT IS GREATER THAN J THEN START AGAIN
   SUB AL,09   // SUBTRACT 9 FROM AL
   JNS START   // JUMP IF NOT NEGATIVE TO START
   MOV AH,02   // INITIALIZING AH TO PRINT MODE
   INT 21H       // INTERUPT TO PRINT
   STOP       // END OF PROGRAM

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