ID Number: Q68562
5.00 5.10 5.10a | 5.10 5.10a
MS-DOS | OS/2
Summary:
The .MODEL assembler directive forces the segments in the resulting
executable program to be ordered as if the DOSSEG directive had been
used. This will override any other directives used to organize
segments in an executable program. The code below demonstrates this
behavior.
Because of this, the options below will be ignored:
/A and /S command line switches
.ALPHA and .SEQ assembler directives
This behavior is not documented and no warnings or errors are
generated.
More Information:
This behavior is also true with QuickAssembler versions 2.01 and 2.51.
The .MODEL assembler directive was designed for use in mixed-language
programming. Because of this, it will automatically order the segments
in a way compatible with the way higher-level language compilers order
them. This will happen even if the <,language> option on the .MODEL
directive is not used.
Sample Code:
The map file created from the linker is included below.
.MODEL medium
.286
.SEQ
.STACK 100h
A SEGMENT WORD PUBLIC 'DATA'
test_data DW 10
A ENDS
B SEGMENT WORD PUBLIC 'CODE'
mov ax,1
B ENDS
END
Map file:
Start Stop Length Name Class
00000H 00000H 00000H _TEXT CODE
00000H 00002H 00003H B CODE
00004H 00004H 00000H _DATA DATA
00004H 00005H 00002H A DATA
00010H 0010FH 00100H STACK STACK
Origin Group
0000:0 DGROUP
When the .MODEL and .STACK directives are removed (.STACK must be
removed because it requires .MODEL), the following map file results.
Note that the segments appear in the proper order in this case.
Start Stop Length Name Class
00000H 00001H 00002H A DATA
00002H 00004H 00003H B CODE