This is an archive of the site as it was in May 2009. Please go to www.rajeshgoli.com/ for latest content.
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C In DOS - Description
These are the Articles that originally appeared in rajeshgoli.com. These Articles mainly deal with systems programming in DOS. Not of much use now-a-days. But may be of some educational value
Lot of people are contacting me for more information on interrupts, IVTs and ISRs. I request you to share any information and queries you have on this forum.
Pointers and its types :
- A near pointer is 16 bit long . It uses the current contents in CS register of CPU. Near pointer is limited to 64KB of memory
- A Far pointer is 32 bit long and can access more than 64KB , Huge pointers are also 32 bit long but they use normalization procedure .
This was one of the questions i was pondering on when i started writing quite a few interactive programs .The problem arised because the OS was a non multithreaded one ( DOS ) . I came up with several ways for doing this . I will try to pesent some of them in the following discussion .
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