How do I switch to vedio mode from text mode

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char * ptr =0xA800;

pointer to pixel of screen. it doesnt work normally in program because generally its a text mode.

What I have tried:

to switch to graphics mode its imp to use either int86 or graphics.h (initgraph). pls tell me if there is any other way to switch to graphic mode i mean through some bios interrupts. and pls try that the code does not depend on os n also not on compiler that is it can run in windows,linux,unix also in gcc and turbo both

Posted 31-Mar-16 6:07am

Ravinder Singh

Updated 31-Mar-16 6:34am

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Patrice T 31-Mar-16 13:29pm

tell which OS and C compiler.

Ravinder Singh 1-Apr-16 12:28pm

every possible os n compiler

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Jochen Arndt · Answer 1 · 2016-03-31T06:34:00

You are trying to access the video memory using an ancient technology used by DOS programs.

This won't work anymore nowadays besides you are writing a DOS program and executing it in real DOS or an DOS emulator like DOSBox. If so, you must use a compiler that can create DOS programs and provides a standard library for DOS like Turbo C.

When using Linux outside a graphical environment you can use the Linux framebuffer - Wikipedia, the free encyclopedia[^] to access the video memory.