Ok i have a small assembly question Post: 302636823

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Top Forums Programming Ok i have a small assembly question Post 302636823 by Errigour on Tuesday 8th of May 2012 03:51:11 AM

05-08-2012

Registered User

Ok i have a small assembly question

I have this small program that runs with the flat assembler. My problem is that at the receive line function it receives the line and if there isn't a $ typed at the end of the user input the program displays a lot of strange stuff, sometimes beeps and then it seems to terminate without causing any damage to m computer. My question is how do I receive a string of characters with assembly maybe with that function without requiring that the user type $ at the end of his/her input.

Code:

ORG 100h ; Start at 100h memory DOS 16 bit .com files
;USE16    ; Use 16 bit mode.
        ; Print line function $ is new line
        ; ah says print line dx is the line to print

        mov ah, 00001001b
        mov dx, msg
        ; Jump to Display It
        jmp DisplayHelloWorld!

DisplayHelloWorld!:
        int 21h

        ; Receive line function
        mov ah, 3fh
        mov dx, Receive
        mov cx, 30
        mov bx, 0
        int 21h

        ; Compare 10d with the value of ah
        cmp dx, Receive
        ; Jump if equal
        je PrintName
        ; Jump if not equal
        jne UnderstandAssembly

UnderstandAssembly:
        ; Call to 21h, again prints line Name
        mov ah, 09h
        mov dx, und
        int 21h

PrintName:
        ; Call to 21h, again prints line Name
        mov ah, 09h
        mov dx, Receive
        int 21h

        ; Tell program to stay alive
        mov ah, 01h
        int 21h
        ; Exit program
        mov ah, 4ch
        int 21h

msg db 'Enter Name: ', '$' ; 0Ah is new line feed, '$' is end of line
und db 'Dx changed before cmp dx, Receive' , '$'
Receive db 30d

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umodem

umodem(1)						      General Commands Manual							 umodem(1)

NAME

       umodem - XMODEM-protocol file transfer program

SYNOPSIS

       [options] files ...

DESCRIPTION

       is a file transfer program that incorporates the well-known XMODEM protocol used on CP/M systems and on the HP 110 portable computer.

   Options
       recognizes the following options and command-line arguments:

	      (one) Employ TERM II FTP 1.

	      Enable TERM FTP 3 (CP/M UG).

	      Enable 7-bit transfer mask.

	      Turn on ARPA Net flag.

	      Enter command mode.

	      Do not delete
			  before starting.

	      (ell) Turn on entry logging.

	      Allow overwriting of files.

	      Print all messages.

	      Receive file.
			  Specify for text, or for binary.

	      Send file.  Specify for text, or for binary.

	      Display file status only.

	      files	  Name of file or files to be transferred.

WARNINGS

       When  a binary file is transferred, the target file may have some extra bytes added at the end. This is due to the limitation of the under-
       lying protocol.

EXAMPLES

       Receive a text file:

       Receive a binary file:

       Send a text file:

       Send a binary file:

AUTHOR

       is in the public domain.

SEE ALSO

       cu(1), kermit(1), uucp(1).

																	 umodem(1)