ID Number: Q79829
6.00 | 6.00
MS-DOS | OS/2
buglist6.00 fixlist6.00a
Summary:
PROBLEM ID: MSM9201003
SYMPTOMS
In the Microsoft Macro Assembler (MASM) version 6.0, the following
error message may be produced
A2075: jump destination too far : by xxxxx byte(s)
when using the /Zm option, the MASM driver with MASM 6.0, or OPTION
M510. When MASM 5.1 compatibility is not used or MASM 5.1 is used,
the code assembles correctly.
CAUSE
This behavior is caused by using the current address operator, $,
minus a constant (for example, jmp $-5), and the MASM driver with
MASM 6.0, OPTION M510, or the /Zm switch when assembling.
RESOLUTION
Use a label instead of the current address operator or assemble
without the MASM 5.1 switch.
STATUS
Microsoft has confirmed this to be a problem in MASM version 6.0.
This problem was corrected in MASM version 6.0a.
More Information:
The /Zm switch is the MASM 5.1 compatibility switch in MASM 6.0. The
MASM driver calls ML with the /Zm option in MASM 6.0. OPTION M510 is a
directive that specifies MASM 5.1 compatibility.
Sample Code
-----------
; Assembly options need: /Zm
DOSSEG
.model small
.STACK
.DATA
.CODE
start: mov al,5h
here: dec al
jnz $-2 ; This line causes the A2075 error.
;jnz here ; Uncomment this line and comment out
mov ax,4c00h ; jnz $-2 to get the code to assemble
int 21h ; correctly.
END start
Additional reference words: 6.00 5.10