From:	"Damian Yerrick" <web DOT poison AT pineight DOT 8m DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: is that right? please correct me.
Date:	Tue, 19 Oct 1999 21:04:49 -0500
Organization:	Rose-Hulman Institute of Technology
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^_^ <StephenH DOT bbs AT bbs DOT TKU DOT edu DOT tw> wrote in message
news:FRK3uCQ8omIE079yn AT bbs DOT TKU DOT edu DOT tw...
> I want to make "patches on binary image executables
> compiled by djgpp", so something I have to be sure first.

Are you making a DJGPP Game Genie or GameShark?
Cheating is bad. Please don't try it on DOSArena; your
computer might blow up to high h*ck.
http://yerricde.tripod.com/binaries/

> after several experiments, I come to a conclusion:
> a EXE compiled by DJGPP (run with CWSDPMI), are just like
> a HUGE .COM file without any RELOCATION table.

.com file, I assume, means tiny model 16-bit DOS program,
not the c:/public/index.html of a North American web server.
(An old web browser saved http://nba.com/ as NBA.COM
causing no end of trouble when I typed NBA into DOS.)

> is this true? it seems Yes to me, but could anyone please
> confirm that ?

FWIW, there's a stub, a COFF header, and an executable
image. The relocation is done by DPMI; programs always
start 4 kilobytes (0x1000 bytes) into the program's allocated
"segment."

(What is the name for "a region of memory accessed by a
particular 386 protected mode selector?)

> really appreciate for your reply

Posted and emailed.

--
Damian Yerrick
CM 398, Rose-Hulman Institute of Technology
5500 Wabash Ave
Terre Haute, IN 47803
http://come.to/yerrick

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