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From: lotto@wjh12.UUCP
Newsgroups: comp.sys.ibm.pc
Subject: MASM quirk, is this a bug or my problem?
Message-ID: <62@wjh12.UUCP>
Date: Sun, 5-Apr-87 09:44:46 EST
Article-I.D.: wjh12.62
Posted: Sun Apr  5 09:44:46 1987
Date-Received: Sun, 5-Apr-87 21:41:48 EST
Reply-To: lotto@wjh12.UUCP (Jerry Lotto)
Organization: Harvard Univ. Chem. Dept.
Lines: 34

The following code fragment was assembled using MASM 4.0, linked with the
linker provided in that package and the exe2bin'ed to a .COM file with
the DOS 3.2 incarnation of that utility.

	Title	FOO

Cseg	segment para 'CODE'
	org	100H
	assume	CS:Cseg, DS:Cseg, ES:Cseg
Start:	jmp	Begin

Label	db	'Post no bills'

Begin:	lea	DX, Cseg:Label
	.
	.
	.
Cseg	ends
	end	Start

When I looked at the resulting code, the line at label begin got:
	LEA	DX, [0003]
100H before the actual location of Label. The same (incorrect)
results were obtained with the source line:
Begin:	lea	DX, CS:Label
Removing the explicit segment reference to make:
Begin:	lea	DX, Label
gave the correct result:
	LEA	DX, [0103]
My understanding of the ASSUME directive is that labels located
in Cseg should assume the use of CS: as the segment register.
No changes are observed with the segment declaration, assume
directive and org assignment in any order!
Why is this a problem? Thanks.