Xref: news2.mv.net comp.os.msdos.djgpp:3629
Newsgroups: comp.os.msdos.djgpp
From: mdruiter AT cs DOT vu DOT nl (Ruiter de M)
Subject: Re: more sizeof questions
Nntp-Posting-Host: galjoen.cs.vu.nl
References: <199605090048 DOT UAA09442 AT eelab DOT newpaltz DOT edu>
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Organization: Fac. Wiskunde & Informatica, VU, Amsterdam
Date: Thu, 9 May 1996 14:11:49 GMT
Message-ID: <Dr563p.55B.0.-s@cs.vu.nl>
Lines: 29
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp

John Fortin (fortin44 AT eelab DOT newpaltz DOT edu) wrote:
: OK, I'm a bit confused..(nothing new i'm afraid)... The structure 
: below was taken from the VESA 1.2 spec. sizeof(_VGAInfoBlock) should 
: be 256.  DJGPP gives 260.  What's up with this.  A previous posting 
: mentioned 4 byte boundaries, but 256 is divisable by 4.  Any Ideas??
: 
: typedef unsigned char 		BYTE;
: typedef unsigned short 	WORD;
: typedef unsigned long		DWORD;
: 
: typedef struct 
: {
:     DWORD	VESASignature;			4
:     WORD	VESAVersion;				2	
DWORDs aligned on 4 byte boundary.                       +2
:     DWORD    	OEMStringPointer;		4
:     DWORD    	Capabilities; 			4
:     DWORD    	VideoModePointer;		4
:     WORD   	TotalMemory;			        2
I guess 2 extra bytes too                                +2
:     BYTE    	Info[236];					236
: }	_VGAInfoBlock;                             =      256 bytes
                                                             +4=260
'Don't know exactly but I think I guessed right :)
-- 
Groeten, Michel.        http://www.cs.vu.nl/~mdruiter
\----/====\----/        
 \  /      \  /         "You know, Beavis, you need things that suck, to have
  \/        \/	        things that are cool.", Butthead.