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From: gert@nikhefh.UUCP (Gert Poletiek)
Newsgroups: comp.sys.atari.st
Subject: Re: How can I access lower ram?
Message-ID: <378@nikhefh.UUCP>
Date: Wed, 22-Jul-87 03:47:35 EDT
Article-I.D.: nikhefh.378
Posted: Wed Jul 22 03:47:35 1987
Date-Received: Fri, 24-Jul-87 03:12:20 EDT
References: <8707131441.AA08574@ucbvax.Berkeley.EDU> <2019@oliveb.UUCP> <210@xrxns.UUCP> <580@ritcv.UUCP>
Reply-To: gert@nikhefh.UUCP (Gert Poletiek)
Organization: Nikhef-H, Amsterdam (the Netherlands).
Lines: 17

In article <580@ritcv.UUCP> mdr7527@ritcv.UUCP (PUT YOUR NAME HERE) writes:
>Can anyone tell me how I can use lower RAM area using Malloc or something
>similar. Apparently the lower 120K can not be gotten to easily because 
>TOS uses that address range even if it is in ROM. Is this correct?
>
>   Thanks for any help.
>				Mark

You might be able to imagine that an operating system needs some data space
to do its work. In the lower 120K of memory are data spaces for the BIOS,
XBIOS, GemDos, VDI and AES. Malloc is a bit simple minded on the ST, but at
least it does not allow you to tamper with those 120K. And unless you are
writing your own operating system you should keep your hands off every part
of those 120K except for the documented system variables.


Gert Poletiek