Huge Program

Posted on 2001-06-12
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?          
Question by:gauravdhup

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


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