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How did old MS-DOS games utilize various APIs?
Nowadays each graphic card has some driver in operating system that translates some (typically) standard API such as OpenGL, so that programmers use some standardized API code to tell graphics cards how and what they want to render. (Actually that’s already a bit hard-core most programmers really use various game engines that do this for them).
How did graphics from graphical DOS games written?
Graphics were generated by directly interfacing with the display hardware, for instance the Color Graphics Adapter. ( CGA) Probably there were libraries, but not like today, and libraries were often not shared outside a company. How did they generate graphics? Games from that era usually wrote directly to the graphics hardware.
What kind of libraries were used for DOS games?
Sound and network driver libraries were common. Which ones, I don’t know – these days you wouldn’t have to provide drivers along with your game due to the Hardware Abstraction Layer provided by the OS itself. Besides this, there were the C/C++ language standard libraries. Game middle-ware libraries didn’t become as common until after that era.
What was the resolution of MS DOS games?
It was popularized by Michael Abrash on the pages of Dr. Dobb’s Journal; you got a 320×240 resolution, that, viewed on a 4:3 monitor, meant the pixels were square.
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