I can't seem to fix this code, can anyone tell me what's wrong?

I want to enter 4 characters using the keyboard and compare it to a string. If they are equal than display a message indicating they are. If not, then display a message inidicating they are not equal and repeat. I'm using an 80186 mpu. Using MASM 6.11. I don't know whats wrong. Before this code, I used the CMPSB (compare string) instruction, and didnt work. So I used this longer code but still don't work. I ran debug and saw the data enterred into the memory but for some reason, I think, the code looks at different segments of memor or something. I don't know, please help. Here's the code:

PASSWORD PROC NEAR

PW2: SUB CX, CX
MOV CX, 0004H ;LOAD COUNTER FOR 4 CHAR
MOV DI, OFFSET PASS_TYPED
PW1: LCDCOMM 42H ;LCD MACRO
MOV AH, 07H ;GET KEYPRESSED
INT 21H
MOV [DI], AL ;MOV KEYPRESSED INTO PASS_TYPED
CALL DATWR ;PROC FOR DISPLAY ON LCD
INC DI
DEC CX
CMP CX, 0
JNE PW1
MOV CX, 0004H
MOV SI, OFFSET PASS ;CORRECT 4 DIGIT CODE
MOV DI, OFFSET PASSENT
PW3: MOV BH, [DI]
MOV BL, [SI]
INC SI
INC DI
DEC CX
CMP BH, BL
JNE WRP
JE PW3
STRINGWR WELC1, 26, 00H, 41 ;MACRO FOR LCD (CORRECT PASSW)
WRP: STRINGWR WRONG, 26, 00H, 41 ;MACRO FOR LCD (WRONG PASSW)
LCDCOMM 46H ;MACRO FOR LCD
LCDPARAM 0BH ;MACRO FOR LCD
LCDPARAM 00H ;MACRO FOR LCD
JMP PW2

RET
PASSWORD ENDP