FIX: EVEN, ALIGN Generate Error in AT Segments (81367)

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

X is equal to 2 for EVEN directives, and equal to the alignment of the ALIGN directive. MASM version 5.1 does not generate this error.

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.

.MODEL small

.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

_bad   SEGMENT PARA AT 0B800H
       ORG 160
       ALIGN 2            ; This line generates the A2189 error.
Line2  LABEL   WORD
_bad   ENDS

.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

END start