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 Post subject: increase memory for real-mode code
PostPosted: Mon Sep 27, 2021 9:55 am 
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Joined: Sat Aug 07, 2021 6:46 am
Posts: 4
Greetings!
I would like to know if it is possible to somehow increase the amount of memory for the code (real mode), not limited to one sector?
thank you in advance.


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 Post subject: Re: increase memory for real-mode code
PostPosted: Mon Sep 27, 2021 10:06 am 
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Joined: Mon Mar 25, 2013 7:01 pm
Posts: 3418
Yes: load more sectors.


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 Post subject: Re: increase memory for real-mode code
PostPosted: Mon Sep 27, 2021 8:11 pm 
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Joined: Mon Jul 05, 2021 6:57 pm
Posts: 35
Hi!
You can use the BIOS Int 13h services to load additional sectors from disk into memory. See https://en.wikipedia.org/wiki/INT_13H (or look for a proper reference). You load the required registers with the appropriate parameters (as documented, eg AH=02 is required to read sectors from disk, and other registers need to be set to specify the sector address and count), then execute "int 13h", and the BIOS will take care of it for you.


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