clock troubles

chezzestix · #1 13-May-2008, 22:52

I've been having trouble with this code so I started placing some custom break points in the code*1 until I found the point at which the program would keil over. I put one break point before the "div bh" in the bcd2ascii function and one after and the computer locks up before the second one is reached.

Whats wrong with my div command?

*1

Code:

mov ah,0 
int 16h 
mov ah,0Eh 
int 10h

Code:

cli 
xor ax,ax 
mov es,ax 
mov fs,ax 
mov gs,ax 
mov ds,ax 
mov ss,ax 
mov sp,0x7C00 
sti 

start: 
mov dx,0 
mov si,0 
mov di,0 
call gettime 
call strtime 
mov ecx,3 
loop0: 
call bcd2ascii 
loop loop0 
mov bh,0 
call asciiout 
call colonout 
call asciiout 
call colonout 
call asciiout 
call crout 
jmp start 

gettime: 
mov ah,02h 
int 1Ah 
ret 

strtime: 
mov [si],ch 
add si,8h 
mov [si],cl 
add si,8h 
mov [si],dh 
add si,8h 
ret 

bcd2ascii: 
mov bh,0Ah 
mov ax,[di] 
mov dx,0 
div bh 
add al,30h 
add ah,30h 
mov [si],al 
add si,8h 
mov [si],ah 
add si,8h 
add di,8h 
ret 

asciiout: 
mov al,[di] 
mov ah,0Eh 
int 10h 
add di,8h 
mov al,[di] 
mov ah,0Eh 
int 10h 
add di,8h 
ret 

colonout: 
mov al,3Ah 
mov ah,0Eh 
int 10h 
ret 

crout: 
mov al,0Dh 
mov ah,0Eh 
int 10h 
ret 

TIMES 510-($-$$) DB 0x00 
SIGNATURE DW 0xAA55

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Rate This Thread
Rate This Thread:

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Displaying signals internal to the architecture part of an entity	aijazbaig1	Miscellaneous Programming Forum	7	04-Sep-2006 08:11
Click Ticks	dayrinni	C Programming Language	1	20-Feb-2006 11:50
logical clock or counters	Krandygrl00	CPP / C++ Forum	1	13-Oct-2005 04:32
FLTK clock box widget	cable_guy_67	FLTK Forum	0	09-Jul-2005 18:51
Computer Clock Problem	kselin	Computer Hardware Forum	7	21-Jun-2005 08:26