Hello the below 8086 ALP program is to display FIRE and HELP messages alternatively with flickering effects on a seven segment display interface... Code: .model small .data msg1 db 86h,88h,of9h,8eh msg2 db 8ch,0c7h,86h,89h .code mov ax,@data mov ds,ax mov dx,133h mov al,80h out dx,al mov cx,25 again: lea si,msg1 push cx call disp call delay lea si,msg2 call disp call delay pop cx loop again mov ah,4ch int 21h disp proc near mov cx,04 l1: mov bl,08 mov al,[si] l2: rol al,01 mov dx,131h out dx,al push ax mov al,0ffh mov dx,132h out dx,al dec bl pop ax jnz l1 l3: inc si loop l1 ret disp endp please explain me how the codes in msg1 and msg 2 are equivalent to "FIRE" and "HELP" and please explain me the display procedure of the 7 segment display interface
It depends whether the 7 segment Common cathode or common anode. Please refer http://en.wikipedia.org/wiki/Seven-segment_display and you can convert accordingly. Hope this helps
