What is Coding of 7 segment display using assembly language?

Answer 1

mov ax, @data ; Initialize data section

mov ds, ax

mov bx, offset lookup ; Load offset of lookup in bx

mov al, key ; key no. in al

xlat ; translate byte in al

mov bh, al ; al = lookup(key)

mov ch, 02h ; Count of digits to be displayed

mov cl, 04h ; Count to roll by 4 bits

l2: rol bh, cl ; roll bl so that msb comes to lsb

mov dl, bh ; load dl with data to be displayed

and dl, 0fH ; get only lsb

cmp dl, 09 ; check if digit is 0-9 or letter A-F

jbe l4

add dl, 07 ; if letter add 37H else only add 30H

l4: add dl, 30H

mov ah, 02 ; Function 2 under INT 21H (Display character)

int 21H

dec ch ; Decrement Count

jnz l2

mov ah, 4cH ; Terminate Program

int 21H

end