Small operating system made in assembly language
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 
 
 

81 lines
1.3 KiB

.model tiny
.486
smart
.code
org 0100h
start:
jmp tsr
offsets dd 0
db 'HOURS'
tsr:
pushf
db 2eh,0ffh,1eh
dw offsets
cli
pusha
push ds es
push cs
push cs
pop ds
pop es
mov ah,22h
mov di,offset infos
int 47h
mov bl,[infos+1]
xor bh,bh
sub bl,8
mov di,bx
shl di,1
mov dx,71h
xor eax,eax
mov cx,0B800h
mov es,cx
mov cl,4
mov bp,8
show:
dec dx
mov al,cl
out dx,al
inc dx
in al,dx
call showbcd
cmp cl,0
je finic
mov byte ptr es:[di],':'
add di,2
sub cl,2
jmp show
finic:
pop es ds
popa
sti
iret
;==============================Affiche le nombre nb hexa en EDX==============
Showbcd:
push ax bx cx edx
mov edx,eax
mov cx,bp
sub cx,32
neg cx
shl edx,cl
mov ax,bp
shr ax,2
bcdaize:
rol edx,4
mov bx,dx
and bx,0fh
add bl,'0'
mov es:[di],bl
add di,2
dec al
jnz bcdaize
pop edx cx bx ax
ret
infos db 40 dup (0)
end start