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From: majid@citycs.UUCP (M Mirmehdi)
Newsgroups: comp.sys.intel,comp.sys.ibm.pc
Subject: Accessing the UMBs between the 640K and 1Mb
Keywords: memory
Message-ID: <99@citycs.UUCP>
Date: 21 Jun 89 12:01:28 GMT
References: <31249@conexch.UUCP>
Reply-To: majid@city.cs.ac.uk (M Mirmehdi)
Organization: City University, London
Lines: 18



Can anyone help please?

I am trying to run an application which uses a number of large arrays. I
fitted almost all I needed in the 570K or so available to DOS
applications. However, I need space for one final large array which
I am hoping to place in the upper memory blocks between the 640K and
1Mb of RAM of my 1M PC-AT.
The program is in C and I am using Microsoft C 5.1. I have tried this
so far:
I tried to place my array in the 640K-1M space and  the program 
seemed to work, but I am obviously overwriting something there, as 
the PC hangs as soon as my program is finished.
Can anyone please tell me of an efficient, PC-friendly way of using
that area? Any suggestions will be appreciated.

Majid Mirmehdi.