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From: tr@thumper.UUCP
Newsgroups: comp.sys.ibm.pc,comp.graphics
Subject: Re: How do I determine how much EGA memory is installed?
Message-ID: <620@thumper.UUCP>
Date: Mon, 6-Apr-87 10:08:01 EST
Article-I.D.: thumper.620
Posted: Mon Apr  6 10:08:01 1987
Date-Received: Sat, 11-Apr-87 03:44:14 EST
References: <548@thumper.UUCP> <988@super.upenn.edu.upenn.edu>
Organization: BellCoRe (Bell Communications Research)
Lines: 40
Keywords: EGA, BIOS
Xref: utgpu comp.sys.ibm.pc:2794 comp.graphics:442
Summary: This is the method ...


OK, I have had help and this is what I have learned.  I am enclosing
an example.  The function called egamem() will return an integer with
a value of 64, 128, 192, or 256.

This example works with Lattice C.  If it does not work with your
compiler, check the declarations for REGS in <dos.h> and make the proper
modification to the program.


#include <stdio.h>
#include <stdlib.h>
#include <dos.h>

main()
{
	printf("You have %d K bytes of video RAM installed.\n", egamem());
}


egamem()
{
	union REGS *in, *out;
	static int amount;

	in  = (union REGS *) malloc(sizeof(union REGS));
	out = (union REGS *) malloc(sizeof(union REGS));
	in->h.ah = 0x12;
	in->h.bl = 0x10;
	int86(0x10, in, out);
	amount = 64 * ((((int) out->h.bl) & 3) + 1);
	free((char *) in);
	free((char *) out);
	return(amount);
}
-- 
Tom Reingold
INTERNET:       tr@bellcore.com
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