DOS and GEM Programming Fun : C
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Page last updated on Jan 12th of 2021.
Programming in C on DOS:

Information on programming in C for DOS. This includes some of the strange needs of segmented memory programming, like dealing with far and near pointers, and intermixing them without causing problems.

Segmented C:

If you thought C was a portable language, you never programmed for Real Mode DOS, or even system level stuff in PMODE (which still has segments). Here is a little bit about the biggest difference between C on real mode x86 systems and C on almost all others. This will at very least get the wheels turning.