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From: psuvm%cjs@psuvax.UUCP
Newsgroups: net.micro.pc
Subject: Does DOS function 48h work?
Message-ID: <411@psuvm.UUCP>
Date: Tue, 3-Jan-84 08:46:28 EST
Article-I.D.: psuvm.411
Posted: Tue Jan  3 08:46:28 1984
Date-Received: Wed, 4-Jan-84 04:58:38 EST
Lines: 19


Has anyone had success using DOS 2.0 function 48h to allocate memory
(page D-43 of DOS 2.0 manual)?  I've been using code like:

                        mov bx,10h    ;number of paragraphs
                        mov ah,48h
                        int 21h

Pretty simple.  Carry flag gets set to indicated an error, and AX
contains the error code 8 -- which means not enough memory.  I've
been able to allocate only 3 paragraphs without error, and these
were put way down in DOS.  Shoot, I got a 640K machine, so there is
pleanty of memory available.

I'd like to allocate a large buffer (4k or more) dynamically.  Don't
want it taking space in my .COM files.  Cannot find any information
on how DOS allocates memory other than that one page in the manual.

Any suggestions?