Date: Fri, 20 Dec 2002 21:10:06 +0300
From: "Eli Zaretskii" <eliz AT is DOT elta DOT co DOT il>
Sender: halo1 AT zahav DOT net DOT il
To: djgpp AT delorie DOT com
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Subject: Re: How to get the amount of free memory
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> From: Hans-Juergen DOT Taenzer AT t-online DOT de (Hans-Juergen Taenzer)
> Newsgroups: comp.os.msdos.djgpp
> Date: 19 Dec 2002 19:10:00 +0100
> 
> how do i get the amount of free real-memory (memory below 1 MB)
> from a running programm?

 #include <dpmi.h>
 #include <go32.h>
 __dpmi_regs regs;
 regs.h.ah = 0x48;
 regs.x.bx = 0xffff;
 __dpmi_int (0x21, &regs);
 printf ("Free DOS Memory: %u Bytes\n", regs.x.bx << 4);

Note that this only gives you the size of the largest free memory
block, and I think it doesn't include the memory between 640K and 1MB.