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From: dslg0849@uxa.cso.uiuc.edu (Daniel S. Lewart)
Newsgroups: comp.binaries.ibm.pc.d
Subject: Re: Borland BGI question
Message-ID: <1990Dec10.190516.12984@ux1.cso.uiuc.edu>
Date: 10 Dec 90 19:05:16 GMT
References: <1990Dec7.121658.25371@aplcen.apl.jhu.edu> <wokXT3w163w@infopls.UUCP> <2505@mentor.cc.purdue.edu> <cbMwB=C00VI8A0oYdi@andrew.cmu.edu>
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Organization: University of Illinois at Urbana
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dd26+@andrew.cmu.edu (Douglas F. DeJulio) writes:

> I've gotten several programs that use BGI files and can choose between
> different display types when they start up.  They're *supposed* to
> auto-detect the correct display type and use it.  On my machine they
> don't.  I've got an AT&T PC6300 which should use the ATT400 BGI
> module.  Programs that autodetect invariably choose CGA.  Ugh.  I own
> Turbo-C and I've checked the manuals, but I couldn't find a way to
> force a particular display type at run time.  Can it be done with an
> environment variable or something?  Any help would be appreciated.
> --
> Doug DeJulio
> dd26@andrew.cmu.edu

The following Turbo Pascal routine works for my AT&T PC6300.  It should be
trivial to translate it to Turbo C.
-------------------------------------------------------------------------------
Uses Graph;

procedure DetectGraph(var GraphDriver,GraphMode: Integer);
const
  ATTLogo = 'OLIVETTI';
  ATTLen  = Length(ATTLogo);
var
  RomId: array[1..ATTLen] of Char absolute $FC00:$0050;
begin
  if RomId <> ATTLogo then
    Graph.DetectGraph(GraphDriver,GraphMode)
  else
  begin
    GraphDriver := ATT400;
    GraphMode   := ATT400Hi;
  end;
end;
-------------------------------------------------------------------------------
Daniel Lewart
d-lewart@uiuc.edu