Unsure as to what I am doing wrong

[LOLA]

After reading the no homework rule I am afraid to even ask anything in this forum but I will try. 
I have been working at this assignment for over a week and after reading all my books and all the postings I could find in the internet I still got nowhere  :(. 
I just want to reasure anyone that is not a lack of trying or wanting someone to do my code for me,  it is just that I truly do not understand assembly, it seems...
Anyhow, my problem is that I need to the get the name of a file from the keyboard.  This is how I set out to do it:

FILEHAND      WORD      ?            ;File handle

;************************************************************************************
PARLIST         LABEL   BYTE      ; START OF PARAMETER LIST

MAXNLEN         Byte   128      ; MAX NUMBER OF DIGITS TO READ IN

TRUE_LENGTH      Byte   ?      ; THE TRUE NUMBER OF DIGITS ENTERED

FILENAME      DB   128 (' ')

;PATHNAME      DB   ' ',0

PROMPTER      Byte   'PLEASE TYPE IN THE FILE NAME: ', 0DH, 0AH, '$'
;*********************************************************************************

;***************************************************************************
; request a file name from client
;***************************************************************************

      MOV   AH,09H         ;SET THE STAGE TO REQUEST USER INPUT
      LEA   DX,PROMPTER      ;LOAD ADDRESS OF DISPLAY TO PRINT OUT
      INT   21H

      MOV   AH,0AH         ;LOAD CODE FOR KEYBOARD REQUEST
      LEA   DX,PARLIST      ;INPUT NUMBER
      INT   21H


      CMP   TRUE_LENGTH,00      ;WAS AT LESS ONE CHAR READ IN?
      JE   A80         ;NO, ONLY A CARRIAGE RETURN..SO STOP

                MOVZX   CX,TRUE_LENGTH

      MOV   BX,CX

;MOV_LOOP2:
;
;      DEC   BX         ; BX POINT TO THE LAST DIGIT TYPE IN
;      MOV   AL,FILENAME[BX]      ; MOVE DIGIT TO AL
;                 LOOP   MOV_LOOP2      ; HAVE WE MOVED ALL DIGITS?
;
;                 MOV   PATHNAME,AL

I tried this other way too but it does not work either
LOOP1:
                DEC   BX         ;BX POINT TO THE LAST CHARA;
      MOV   FILENAME[SI+BX],AL   ;MOVE CHAR TO AL
      MOV    FILENAME[BX],AL   ;PLACE CHAR INTO REPLY MESSAGE
      CMP   BX,00H                      ;HAVE WE MOVED ALL DIGITS?
      JNE   LOOP1

      MOV   FILENAME[BX+1],0      ;triying to make an asciiz string out of the file name

B10OPEN      PROC    NEAR         ;Uses AX, BP, CX, DX
;***************************************************************************
;
; Open file, test if valid:
;
;******************************************************************************

      PUSHA               ;RESERVE GENERAL REGISTERS

      MOV   AH,3DH         ;Request open
      MOV   AL,00         ;Normal file
      LEA   DX,FILENAME
      INT   21H
      JC   B20         ;Error?
      MOV   FILEHAND,AX      ;no, save handle
      JMP   B90

B20:      LEA   BP,OPENMSG      ;yes, message
      MOV   CX,40         ;length
      INC   ROW         ;SET UP FOR NEXT ROW
      MOV   COLUMN,ZERO      ;SET COLUMN TO ZERO
      CALL    DISPLAY         ;error message
      MOV   ENDCODE,01      ;yes,
B90:   POPA               ;RESTORE GENERAL REGISTERS
      RET
B10OPEN   ENDP



obviously the code is not working and I get an error of does the file exist.
Could you tell me what is it that I am doing wrong?
I am very new at this and do not quite understand, if this posting violates the homework rule I apologize in advance, just let me know and I will not post anything again.  As I said, I do not expect anyone to write my code, I just want to understand what I am doing wrong. 
Thanks in advance

I figured out!!!!! :lol :lol :lol :dance: :dance:

[sluggy]

Hi lola,
welcome to the forum. Your question is fine, you haven't broken the golden "no homework" rule because you have already done most of the work yourself, and you are asking about a specific problem. What we don't like is people who post requesting or demanding that someone does all the work for them.

Congratulations on working out what your bug was, i would suggest that you post the answer here as well, so if someone comes searching on this topic in the future they can see what you did to solve your problem. But that is just a suggestion - you don't have to  :P

Also, i'm moving this thread to the 16 bit subforum, which is a more appropriate spot for it.