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From: "Benjamin David Lunt" <zfysz AT frontiernet DOT net>
Newsgroups: comp.os.msdos.djgpp,comp.os.msdos.programmer
References: <0KGZ00GQ8UBIYMM0 AT mta4 DOT srv DOT hcvlny DOT cv DOT net> <gqadn4$qc1$1 AT aioe DOT org> <9NFyl.43886$5t4 DOT 31555 AT newsfe24 DOT iad> <gqh2hb$hdk$1 AT aioe DOT org>
Subject: Re: DJGPP Setup?
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Date: Thu, 26 Mar 2009 16:50:21 -0700
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To: djgpp AT delorie DOT com
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"Rod Pemberton" <do_not_have AT nohavenot DOT cmm> wrote in message 
news:gqh2hb$hdk$1 AT aioe DOT org...
> "Benjamin David Lunt" <zfysz AT frontiernet DOT net> wrote in message
> news:9NFyl.43886$5t4 DOT 31555 AT newsfe24 DOT iad...
>> "Rod Pemberton" <do_not_have AT nohavenot DOT cmm> wrote in message
>> news:gqadn4$qc1$1 AT aioe DOT org...
>> Anyway, it has been years since I even thought about doing
>> this.
>>
>
> BTW, what were you using these values for?  And, a bunch of them just say
> "CS".  Were there values provided for those that you could fill in?
> http://www.frontiernet.net/~fys/yourhelp.htm
>

When we were heavy into the Hugi Compo
   http://www.hugi.scene.org/compo/
there were a lot of people concerned with what the initial
DOS values were at program start.  I just took it a little
further for the information.  Nothing more really.

The value for CS changed depending on the programs/data
you already had loaded.  DOS set DX to CS most of the time
at program start (.COM start).  Maybe it did a:

  mov  dx,cs
  mov  ds,dx
  mov  es,dx

just before DOS gave control to CS:100h.  I don't know,
I never single stepped it to find out.

Thanks,
Ben


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