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assume cs:code
data segment
	db 10 dup(0)
data ends
code segment
start:
	mov ax,12666
	mov bx,data
	mov ds,bx
	mov di,0
	call dtoc
	mov dh,8
	mov dl,3
	mov cl,2
	call show_str
	mov ax,4c00h
	int 21h
dtoc:
	push ax
	push cx
GetNumber:
	mov cx,10
	call divdw
	add cx,30h
	mov ds:,cl
	mov cx,ax
	jcxz OK
	inc di
	jmp short GetNumber
OK:
	pop cx
	ret                        ; faild  
divdw:			;div number dx=hight number ax=low number 
	push bx
	push ax
	mov ax,dx
	sub dx,dx
	div cx
	mov bx,ax
	pop ax
	div cx
	mov cx,dx
	mov dx,bx
	pop bx
	ret
show_str:			;show string function
	push si
	push ax
	push es
	push di
	push bx
	push cx
	mov ax,0
	mov al,10
	mul dh
	mov bx,0b800h
	add bl,al
	add bl,dl
	mov es,bx
	mov di,0
	show:
		pop dx		;use cx show color
		push dx
		mov cl,0
		mov ch,ds:
		jcxz endShow
		mov bl,ds:
		mov es:,bl
		mov es:,dx
		inc si
		add di,2
		jmp short show
endShow:	
	pop cx
	pop bx
	pop di
	pop es
	pop ax
	pop si
	ret
code ends
end start

I want show a data in 80*25 Character mode!
but !a problem!
when I use Debug to debug this program
I find out that ret instruction is faild!!
the following code is my debug code:

AX=0000  BX=13DB  CX=0000  DX=0000  SP=FFFA  BP=0000  SI=0000  DI=0004
DS=13DB  ES=13CB  SS=13DB  CS=13DC  IP=002B   NV UP EI PL NZ NA PO NC
13DC:002B E303          JCXZ    0030
-t

AX=0000  BX=13DB  CX=0000  DX=0000  SP=FFFA  BP=0000  SI=0000  DI=0004
DS=13DB  ES=13CB  SS=13DB  CS=13DC  IP=0030   NV UP EI PL NZ NA PO NC
13DC:0030 59            POP     CX
-t

AX=0000  BX=13DB  CX=008C  DX=0000  SP=FFFC  BP=0000  SI=0000  DI=0004
DS=13DB  ES=13CB  SS=13DB  CS=13DC  IP=0031   NV UP EI PL NZ NA PO NC
13DC:0031 C3            RET
-t

AX=0000  BX=13DB  CX=008C  DX=0000  SP=FFFE  BP=0000  SI=0000  DI=0004
DS=13DB  ES=13CB  SS=13DB  CS=13DC  IP=317A   NV UP EI PL NZ NA PO NC
13DC:317A 0000          ADD     ,AL                         DS:13DB=00
-t

AX=0000  BX=13DB  CX=008C  DX=0000  SP=FFFE  BP=0000  SI=0000  DI=0004
DS=13DB  ES=13CB  SS=13DB  CS=13DC  IP=317C   NV UP EI PL ZR NA PE NC
13DC:317C 0000          ADD     ,AL                         DS:13DB=00
-

why ret return faild!!!
I think ret Should be return to "mov dh,8" here!!
but......

Yeah....you are right..
I'm so careless.... :sad: :sad:
thank you very much :)