Subj : Re: Question about memory size finding...?
To   : borland.public.cpp.borlandcpp
From : waking
Date : Fri Sep 16 2005 10:45 pm

On Tue, 13 Sep 2005 23:29:25 +0500, "mujeebrm" <mujeebrm@yahoo.com> wrote:

> int86(16, &inregs, &outregs);
> memsize = outregs.x.ax;

Why are you using decimal 16 above? That's 0x10 which is the video interrupt.
You should be using 0x12 (dec 18) for conventional memory blocks.

>how can i modify/convert this program
>so that it show full system memory  ( base mem + extended mem) in 16 bit 
>environ

That depends on various factors. If you are running under DOS with no XMS or
EMS managers loaded, then you can simply use:

/* MEMORIES.C - Shows how much conventional and extended RAM is available.
 * (Excluding extended memory taken by an XMS driver.)
 * Programmed July 1997 by Wayne A. King for demonstration purposes.
 */
#include <dos.h>
#include <stdio.h>

int main()
{
    union REGS regs;

    printf("\nConventional memory = %dK\n", int86(0x12, &regs, &regs));
    regs.h.ah = 0x88;
    int86(0x15, &regs, &regs);
    printf("Extended memory = %dK\n", regs.x.ax);
    return 0;
}

If you have an XMS/EMS manager loaded you have to interrogate it to get
the numbers.

--
Wayne A. King 
(waking@idirect.com, Wayne_A_King@compuserve.com)

.