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Huge Program

Posted on 2001-06-12
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Last Modified: 2010-04-02

Sorry i donot have enough points
I am new to this site and i am not clear on how to earn points


I have written a C program whose executable size is around 540 Kb. My DOS free space is slightly more than this ( I have optimized the memory. We have loaded device drivers ).  The program is handling hectic amount of data and executable file size cannot be reduced further. I am not able to run the program under DOS.  Is it possible to access the RAM from DOS mode in program and How?          
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Question by:gauravdhup
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6 Comments
 
LVL 2

Expert Comment

by:MadYugoslav
ID: 6181224
Folow this question:
http://www.experts-exchange.com/jsp/qShow.jsp?ta=msdos&qid=20133603

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You earn experts points when You answer right on some question, and expert who make question give points to You.
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LVL 32

Accepted Solution

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jhance earned 40 total points
ID: 6183817
Does this program have to remain a 16-bit program and subject to the 640K limit?  

What about a protected mode extender?  Even DJCPP might work here.  Most commercial C compilers had 32-bit protected mode available.

What about EXTENDED memory?  

Some of what you say doesn't seem to make sense.  You say "hectic amount of data" and then follow it up with "executable size".  These are UNRELATED!!!!  Can you move your data OUT of precious LOW memory and into extended memory or onto disk?
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LVL 2

Expert Comment

by:GloriousRain
ID: 6184415
Hi gauravdhup,
A program can significant increase the data memory with Expanded Memory. Expanded Memory is a technique by which large amounts of extra memory are swapped in and out of the PC's address space in a paging operation.

The memory must be accessed only through calls to the EMM API. The EMM API is used through calls to 0x67 interrupt with function codes in the AH register.
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Expert Comment

by:amp072397
ID: 6789737
gauravdhup:

You have many open questions:

http://www.experts-exchange.com/jsp/qShow.jsp?ta=visualbasic&qid=20132599
http://www.experts-exchange.com/jsp/qShow.jsp?ta=visualbasic&qid=20133812
http://www.experts-exchange.com/jsp/qShow.jsp?ta=visualbasic&qid=20249739
http://www.experts-exchange.com/jsp/qShow.jsp?ta=cplusprog&qid=20133818
http://www.experts-exchange.com/jsp/qShow.jsp?ta=gamesgen&qid=20234794
http://www.experts-exchange.com/jsp/qShow.jsp?ta=linux&qid=20177490
http://www.experts-exchange.com/jsp/qShow.jsp?ta=win2k&qid=20240804

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thanks!
amp
community support moderator
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LVL 11

Expert Comment

by:griessh
ID: 6817231
I suggest to accept "jhance"' comment. The MSDOS solution MadYugoslav points to might not help with 'handling hectic
amount of data'.

PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER!
======
Werner
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LVL 6

Expert Comment

by:Mindphaser
ID: 6996966
Force accepted

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