19:34
Description: An assembly language routine
to display timer tick on the top right corner of display screen in the
following format: HH:MM:SS
Assembly Language Code
[org 0x0100]
jmp start
incTime: dw 0
hrs: dw 0
min: dw 0
sec: dw 0
clearScreen:
push ax
push di
push es
mov ax , 0xB800
mov es , ax
mov di , 0
nextCls:
mov word [es:di] , 0x0720
add di , 2
cmp di , 4000
jne nextCls
pop es
pop di
pop ax
ret
printTime:
push bp
mov bp , sp
push ax
push bx
push cx
push dx
push si
push di
push es
call clearScreen
mov si , 0 ;counter
to use 3 prints i.e. Hrs, Min, Sec
mov ax , 0xB800
mov es , ax
mov di , 142
nextState:
mov bx , bp
sub bx , si
add bx , 8
mov ax , [bx] ;BX=BP-SI+8
mov bx , 10
mov cx , 0
nextDigit:
mov dx , 0
div bx
add dl , 0x30
push dx
inc cx
cmp ax , 0
jnz nextDigit
nextPos:
pop dx
mov dh , 0x07
mov [es:di] , dx
add di , 2
loop nextPos
add si , 2
cmp si , 6
jz return
mov dl , ':'
mov [es:di] , dx
add di , 2
jmp nextState
return:
pop es
pop di
pop si
pop dx
pop cx
pop bx
pop ax
pop bp
ret 6
Clock:
push ax
inc word [cs:incTime]
cmp word [cs:incTime] , 18
jz Reset
proceedToCall:
push word [cs:hrs]
push word [cs:min]
push word [cs:sec]
call printTime
mov al , 0x20
out 0x20 , al
pop ax
iret
Reset:
mov word [cs:incTime] , 0
inc word [cs:sec]
cmp word [cs:sec] , 60
jnz proceedToCall
mov word [cs:sec] , 0
inc word [cs:min]
cmp word [cs:min] , 60
jnz proceedToCall
mov word [cs:min] , 0
inc word [cs:hrs]
cmp word [cs:hrs] , 24
jnz proceedToCall
mov word [cs:hrs] , 0
jmp proceedToCall
start:
xor ax , ax
mov es , ax
cli
mov word [es:8*4] , Clock
mov word [es:8*4+2] , cs
sti
mov dx , start
add dx , 15
mov cl , 4
shr dx , cl
mov ax , 0x3100
int 0x21
what is this ?? so many errors??
ReplyDeletei cant run this in dox box. got so many errors
ReplyDelete