Article #19040: TA - CREATING A .COM FILE TLINK /V

 Technical Notes Database

TN4040C.txt   TA  - CREATING A .COM FILE TLINK /V
Category   :Pascal
Platform    :All
Product    :TD  1.x 2.0

Description:
Q.     How do I create a .COM file from my .ASM file?  Whenever
     I try to create the .COM with TLINK /t I always get the
     message invalid entry point.  I can create the .COM file
     with EXE2BIN.
A.     In order to create a .COM file with TLINK /t you must
     specify an entry point at offset 100h in the file with
     both the ORG and END directives.   The following code
     fragment demonstrates the required conditions.  Also, a
     .COM file may not exceed 64K in size, may not have any
     segment-relative fixups, may not define a stack segment,
     and must have a starting address equal to 0:100h.  When an
     extension other than .COM is used for the executable file
     (.BIN, for example),the starting address may be either 0:0
     or 0:100h.
     .model tiny
     .code
     ORG 100H
     start:          ;this will be the entry point at 100H
     .
     .
     .
     END start     ;specify the entry point with END
     or
     mycode SEGMENT 'CODE'
           assume cs:mycode,ds:mycode,ss:mycode
           ORG 100H
           start:
           .
           .
           .
     mycode ends
           end start


Reference:


7/2/98 10:45:33 AM
 

Last Modified: 01-SEP-99