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I meant that that the game programmer can just add its own code to the game to manipulate its own low level function as the operating system does provide in a common executables,and load it into the boot mode using its own bootstrap

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closed as off-topic by Aryabhata, Yuval Filmus, David Richerby, Raphael Mar 14 '14 at 9:36

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "This question does not appear to be about computer science, within the scope defined in the help center." – Aryabhata, Yuval Filmus, David Richerby, Raphael
If this question can be reworded to fit the rules in the help center, please edit the question.

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    $\begingroup$ Sure. Think of the OS as part of game. But this is off-topic here. Voting to close. $\endgroup$ – Aryabhata Mar 14 '14 at 1:32
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Yes, it is possible to boot computer to the specially designed program, which will be some game. But this will be harder, because there will be no drivers for advanced hardware, only elementary BIOS functions, basic video memory access. For example, if author want to add sound to the game, he can used PC speaker, or write own driver for ... for which card? Sound blaster, or RTL? What if user has another card? Same problem for video: game may know about some Radeon and will not work on older or newer AMD card or on Nvidia or Intel.

So, writing a bootable computer game is the same as writing both the game and the Operating System with drivers (or stealing its codes like in PS4's Orbis OS with FreeBSD sources or SteamOS with linux sources).

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