Category : Recently Uploaded Files
Archive   : 80XXX_94.ZIP
Filename : BLINK.ASM

;-------------------
;Blink.Asm- the keyboard LED's
;
cseg segment
assume cs:cseg
org 100h ; COM format
Start:
sub ax,ax ; set DS to 0000
mov ds,ax
mov cx,0fh ; number of times to cycle

Blink:
mov bx,0417h ; Pointing to 0000:0417
mov byte ptr [bx],16d ; Turn only Scroll Lock ON
call Delay
mov byte ptr [bx],64d ; Turn only Caps Lock ON
call Delay
mov byte ptr [bx],32d ; Turn only Num Lock ON
call Delay

loop Blink ; Loop 15 times then
mov ax,4C00h ; exit to DOS.
int 21h ;
Delay:
mov ah,01h ; update the BIOS and
int 16h ; turn the LED's on.

push cx
mov cx,0A000h
lo1: in al,4Fh ; Port 4Fh is used for
loop lo1 ; a do-nothing delay.
pop cx
ret

cseg ends
end Start