FIX: EVEN, ALIGN Generate Error in AT Segments

The information in this article applies to:

• Microsoft Macro Assembler for MS-DOS, version 6.0
• Microsoft Macro Assembler for OS/2, version 6.0

SYMPTOMS

The Microsoft Macro Assembler (MASM) version 6.0 incorrectly generates the following error when an EVEN or ALIGN statement is used in a segment that has an "AT" combine type:

   error A2189: invalid combination with segment alignment : X

STATUS

Microsoft has confirmed this to be a problem in MASM version 6.0. This problem was corrected in MASM version 6.0a.

Sample Code

; Assemble options needed: none

;Hello.asm - This program writes "Hello world." in red at the top of

;            screen.

.STACK 4096

.DATA msg DB 'H', 0Ch, 'e', 0Ch, 'l', 0Ch, 'l', 0Ch, 'o', 0Ch, ' ', 0Ch

       DB 'w', 0Ch, 'o', 0Ch, 'r', 0Ch, 'l', 0Ch, 'd', 0Ch, '.', 0Ch

       ORG 160
       ALIGN 2            ; This line generates the A2189 error.
Line2  LABEL   WORD

.CODE start: mov ax, @data

       mov ds, ax

       mov ax, SEG Line2
       mov es, ax

       mov di, OFFSET Line2
       mov si, OFFSET msg

       mov cx, 0Ch

       rep movsw

       mov ax, 4C00h
       int 21h