Giúp đỡ vxl 8086 điều khiển 8 led matrix đơn sắc

[viboyth.haui]

Mình đang làm đồ án môn vi xử lý 8086 đề tài: Chạy dòng chữ bất kì trên 8 led matrix đơn,sử dụng IC ghi dịch 74hc595,code viết bằng ngôn ngữ asm,8086 ghép nối 8255a. chủ đề hiển thị trên 8 matrix này em đã thực hiện được đồi với vđk 8051 dùng C. Cũng với thuật toán như vậy nhưng e viết cho vxl 8086 thì có hiện tượng mất nét,sai nét chữ:
đây là dòng chữ A,B,...,H nhưng bị sai nét


e dùng PortA của 8255 để quét cột,các chân 11,12 của các IC 74595 được nối với PB0,PB1,chân SDA nối với PC7

Nhờ mọi người chỉ lỗi sai giúp mình với,mình kém về asm
code:

; multi-segment executable file template.

data segment
PA EQU 0h
PB EQU 02h
PC EQU 04h
TG EQU 06h
i dw 0
j dw 0
k dw 0


mang DB 3H,0EDH,0EEH,0EEH,0EEH,0EDH,3H,0FFH ;A
DB 0H,76H,76H,76H,76H,89H,0FFH,0FFH
DB 81H,7EH,7EH,7EH,7EH,0BDH,0FFH,0FFH
DB 0H,7EH,7EH,7EH,7EH,0BDH,0C3H,0FFH
DB 0H,6EH,6EH,6EH,6EH,6EH,0FFH,0FFH
DB 0H,0EEH,0EEH,0EEH,0EEH,0FEH,0FFH,0FFH
DB 81H,7EH,7EH,6EH,6EH,8DH,0EFH,0FFH
DB 0H,0E7H,0E7H,0E7H,0E7H,0H,0FFH,0FFH
DB 7EH,7EH,0H,7EH,7EH,0FFH,0FFH,0FFH
DB 0BEH,7EH,7EH,80H,0FEH,0FEH,0FFH,0FFH ;J
DB 0H,0E7H,0E7H,0DBH,0BDH,7EH,0FFH,0FFH
DB 0H,7FH,7FH,7FH,7FH,7FH,0FFH,0FFH
DB 0H,0FDH,0FBH,0F7H,0FBH,0FDH,0H,0FFH
DB 0H,0FDH,0FBH,0F7H,0EFH,0DFH,0H,0FFH
DB 81H,7EH,7EH,7EH,7EH,7EH,81H,0FFH
DB 0H,0EEH,0EEH,0EEH,0EEH,0F1H,0FFH,0FFH
DB 81H,7EH,7EH,5EH,5EH,81H,7FH,0FFH
DB 0H,0EEH,0EEH,0CEH,0AEH,71H,0FFH,0FFH
DB 0B1H,6EH,6EH,6EH,6EH,9DH,0FFH,0FFH
DB 0FEH,0FEH,0FEH,0H,0FEH,0FEH,0FEH,0FFH
DB 80H,7FH,7FH,7FH,7FH,7FH,80H,0FFH
DB 0E0H,0DFH,0BFH,7FH,0BFH,0DFH,0E0H,0FFH
DB 3EH,0DDH,0EBH,0F7H,0EBH,0DDH,3EH,0FFH
DB 7CH,0BBH,0D7H,0EFH,0F7H,0FBH,0FCH,0FFH
DB 3FH,5EH,6EH,76H,7AH,7CH,7EH,0FFH
DB 80H,7FH,0BFH,0CFH,0BFH,7FH,80H,0FFH
DB 81H,7EH,7EH,7EH,81H,0FFH,0FFH,0FFH ;0
DB 7BH,7DH,0H,7FH,7FH,0FFH,0FFH,0FFH ;1
DB 79H,3EH,5EH,6EH,71H,0FFH,0FFH,0FFH ;2
DB 0BDH,6EH,6EH,6EH,91H,0FFH,0FFH,0FFH ;3
DB 0CFH,0D7H,0DBH,0DDH,0H,0DFH,0FFH,0FFH ;4
DB 0B0H,76H,76H,76H,8EH,0FFH,0FFH,0FFH ;5
DB 81H,6EH,76H,76H,8DH,0FFH,0FFH,0FFH ;6
DB 0FEH,0FEH,0F6H,0F6H,0H,0F7H,0FFH,0FFH ;7
DB 89H,76H,76H,76H,76H,89H,0FFH,0FFH ;8
DB 0F9H,76H,76H,76H,76H,81H,0FFH,0FFH ;9
DB 0ffh,0ffh,0ffh,0ffh,0ffh,0ffh,0ffh,0ffh
DB 0ffh,0ffh,0ffh,0ffh,0ffh,0ffh,0ffh,0ffh
DB 0ffh,0ffh,0ffh,0ffh,0ffh,0ffh,0ffh,0ffh
DB 0ffh,0ffh,0ffh,0ffh,0ffh,0ffh,0ffh,0ffh
DB 0ffh,0ffh,0ffh,0ffh,0ffh,0ffh,0ffh,0ffh
DB 0ffh,0ffh,0ffh,0ffh,0ffh,0ffh,0ffh,0ffh
DB 0ffh,0ffh,0ffh,0ffh,0ffh,0ffh,0ffh,0ffh
DB 0ffh,0ffh,0ffh,0ffh,0ffh,0ffh,0ffh,0ffh


cot db 01h,02h,04h,08h,10h,20h,40h,80h
ends

stack segment
dw 128 dup(0)
ends

code segment

main proc
; set segment registers:
mov ax, data
mov ds, ax
mov es, ax

mov al,080h
out tg,al

lap4: mov i,0
lap3: ;cmp j,0
;je lap2

mov j,0
cmp i,288
je lap4

add i,1
lap2: cmp k,0
je lap1
mov k,0
add j,1
cmp j,45
je lap3

lap1: mov bx,k
mov al,cot[bx]
out PA,al



mov bx,k
add bx,i
add bx,56
mov al,mang[bx]
call quet



mov bx,i
add bx,k
add bx,48
mov al,mang[bx]
call quet


mov bx,i
add bx,k
add bx,40
mov al,mang[bx]
call quet

mov bx,i
add bx,k
add bx,32
mov al,mang[bx]
call quet


mov bx,i
add bx,k
add bx,24
mov al,mang[bx]
call quet

mov bx,i
add bx,k
add bx,16
mov al,mang[bx]
call quet

mov bx,i
add bx,k
add bx,8
mov al,mang[bx]
call quet

mov bx,i
add bx,k
mov al,mang[bx]
call quet

call chot
call delay


cmp k,7
je lap2
add k,1
jmp lap1



main endp

quet proc
mov cx,8
mov ah,al
quetled: mov al,ah
and al,80h
out PC,al
mov al,ah

shl al,1
mov ah,al
mov al,0h
out PB,al
mov al,01h
out PB,al
loop quetled
ret
quet endp
chot proc
mov al,0
out PB,al
mov al,2
out PB,al
ret
chot endp
delay proc

nop


ret
delay endp

end ; set entry point and stop the assembler.

Thanks!