Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!watmath!clyde!rutgers!sri-unix!hplabs!hao!nbires!mmm
From: mmm@nbires.UUCP
Newsgroups: comp.sys.ibm.pc
Subject: DOS function 4Bh and 2.11
Message-ID: <975@nbires.UUCP>
Date: Thu, 29-Jan-87 15:17:06 EST
Article-I.D.: nbires.975
Posted: Thu Jan 29 15:17:06 1987
Date-Received: Sat, 31-Jan-87 05:58:20 EST
Organization: NBI,Inc, Boulder CO
Lines: 19

it seems i have a little problem.  dos function 4bh, subfunction 3 
(load overlay) will corrupt the loaded program.  it probably has something
to do with segment fixups.  DDJ ran an artical last year (so i have heard)
explaining exactly what the problem was, but i can't seem to locate the
artical.

the symptoms are as follows: AX=4b03h, ES:XX point to the overlay data
block (the one for dos).  a breakpoint is placed imediately after the 
load overlay (which, by the way is an EXE file).  the word at 123fh in
the code segment contains the DATA segment.  this looks like a misplaced
fixup. 

points to the soultion would be apprecieated.

lloyd w. tabb
nbi engineering
boulder, co 80302
(303)-444-5710 x3116
{allegra|ucbvax|hao}!nbires!mmm