Assembly programming anyone?

[3 blue merks]

Not sure if there are any assembly programmers here but I will give it a shot anyway. I am trying to write a simple password program that will take in 4 digits, store them in a buffer, then compare them to the string. If the 2 match, it will display UNLOCK message, if they don't match it will display LOCK message. I am using TASM to do the assembling but that doesn't really matter. My code is not working correctly however and I am not sure why. Here is the code if anyone wants to have a look and tell me if they see a problem.

DTSEG		SEGMENT
SECRET_CODE	DB	"1234"
STRING		DB	"Enter 4-digit code ",07H,24H
UNLOCK		DB	" Unlocked",07H,24H
LOCKED		DB	" Incorrect code: LOCKED",07H,24H
INBUF		DB	20	DUP(?)
DTSEG		ENDS


                        MOV AH,9H
			MOV DX,OFFSET STRING
			INT 21H
			MOV	DI,OFFSET INBUF		

NXTCH:		   MOV	AH,7H				
			INT	21H
			CMP AL,0DH
			JE 	CHECK
			MOV	[DI],AL				 
			INC	DI					 
			MOV	AH,2H
			MOV DL,'*'
			INT	21H
			JMP	NXTCH				

CHECK:		   MOV AL,0H
			MOV	[DI],AL
			MOV	DI,OFFSET INBUF
			MOV	BX,OFFSET SECRET_CODE
			CMP BX,DI
			JE	UNLOCKED
			MOV AH,9H
			MOV	DX,OFFSET LOCKED
			INT	21H
			MOV	AH,4CH				
			INT	21H					
	
UNLOCKED:	MOV AH,9H
			MOV	DX,OFFSET UNLOCK
			INT	21H
			MOV	AH,4CH				
			INT	21H

 

[Ð88]

I only know MIPS architecture, what's the one you're using called?

 

[3 blue merks]

Intel 8086/88.