how you can programming a clock (but: i experimenting on fat12, too.)

i have programmed today a bios clock function. you must the hour, .. change in a hexadeziaml number, because when you dont chance it, its comming out mysterious characters. here the code:

clock:

mov ah, 0x02

int 0x1A

mov ax, cs

mov ds, ax

mov es, ax

mov di, Zeit

mov al, ch

shr al, 4

or al, 0x30

stosb

mov al, ch

and al, 0x0F

or al, 0x30

stosb

inc di

mov al, cl

shr al, 4

or al, 0x30

stosb

mov al, cl

and al, 0x0F

or al, 0x30

stosb

inc di

mov al, dh

shr al, 4

or al, 0x30

stosb

mov al, dh

and al, 0x0F

or al, 0x30

stosb

mov si, Zeit

mov cx, strlen

print_bios:

lodsb

mov ah,0x0E

int 0x10

loop print_bios

mov ax, 0x4C00

int 0x21

Zeit: db "00:00:00"

strlen EQU $-Zeit

here is a video to the clock function(made by me)

http://www.youtube.com/watch?v=eA2hoM6tGJE