Ok i have a small assembly question Post: 302638067

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Top Forums Programming Ok i have a small assembly question Post 302638067 by Errigour on Wednesday 9th of May 2012 10:38:44 PM

05-09-2012

Registered User

alright could you show me how to concatenate '$' to dx before I print Receive. Here's a cleaner version of the program. Line number eighteen is the line that needs concatenating.

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 ; 09h
        mov dx, msg
        int 21h

        ; Receive line function
        mov ah, 3fh
        mov dx, Receive
        mov cx, 1Eh       ; 30d
        mov bx, 0h
        int 21h

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

        ; Receive one character to STDIN stored in AL
        mov ah, 01h
        int 21h

PrintFiveCharacters:
        ; Write one character to STDOUT
        mov ah, 02h
        mov dl, al
        int 21h
        add cx, 1d
        cmp cx, 4d
        je PrintFiveCharacters

        ; 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
Receive db 30d

Errigour

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LEARN ABOUT V7

as

AS(1)							      General Commands Manual							     AS(1)

NAME

       as - assembler

SYNOPSIS

       as [ - ] [ -o objfile ] file ...

DESCRIPTION

       As  assembles  the  concatenation  of the named files.  If the optional first argument - is used, all undefined symbols in the assembly are
       treated as global.

       The output of the assembly is left on the file objfile; if that is omitted, a.out is used.  It is executable if no errors  occurred  during
       the assembly, and if there were no unresolved external references.

FILES

       /lib/as2       pass 2 of the assembler
       /tmp/atm[1-3]? temporary
       a.out	      object

SEE ALSO

       ld(1), nm(1), adb(1), a.out(5)
       UNIX Assembler Manual by D. M. Ritchie

DIAGNOSTICS

       When  an  input	file cannot be read, its name followed by a question mark is typed and assembly ceases.  When syntactic or semantic errors
       occur, a single-character diagnostic is typed out together with the line number and the file name in which it occurred.	Errors in  pass  1
       cause cancellation of pass 2.  The possible errors are:

       )  Parentheses error
       ]  Parentheses error
       <  String not terminated properly
       *  Indirection used illegally
       .  Illegal assignment to `.'
       a  Error in address
       b  Branch instruction is odd or too remote
       e  Error in expression
       f  Error in local (`f' or `b') type symbol
       g  Garbage (unknown) character
       i  End of file inside an if
       m  Multiply defined symbol as label
       o  Word quantity assembled at odd address
       p  `.' different in pass 1 and 2
       r  Relocation error
       u  Undefined symbol
       x  Syntax error

BUGS

       Syntax errors can cause incorrect line numbers in following diagnostics.

								       PDP11								     AS(1)