Detecting total RAM size via BIOS

From: Jeremy Harrison (jeremy_at_lava.net)
Date: 04/27/04 

Date: Mon, 26 Apr 2004 22:31:21 +0000 (UTC)

In follow-up to the post below, I hope someone might be able to help me
with my problem. I am trying to write a routine that will return the size
of RAM on the host computer. I need it to run from a command prompt, and
I need it to work on each OS from Windows 95 through XP. As an analog,
WinMSD returns the wished for information (along with a lot of other stuff)
on machines that have WinMSD (2000/XP). I want to roll a "specialized"
application that will only return the total RAM size. I write my
routines in PC Assembly; my suspicion is that I can get RAM information
by peeking in at some port. I just haven't been able to determine which
one...

Albeit not RAM/memory related, the posting below made me think that
perhaps one of you may know of a method and port if not something even
simpler that I can use.
 
Thank you for your assistance!
Jeremy Harrison

    #include <stdio.h> /* printf() */
    #include <dos.h> /* peek(), peekb() */
    int main(void) {
    unsigned i = peek(0x40, 0x10); /* same as INT 11h */
    if(i & 0x01) {
    i = ((i / 64) & 0x03) + 1;
    printf("%u floppy drive(s) detected\n", i); }
    printf("%u hard drive(s) detected\n", peekb(0x40, 0x75));
    return 0; }