Doom has been played on pretty much everything nowadays: a rotary phone, via Twitter, and even on 100 pounds of mouldy potatoes. So in that spirit of playing Doom on all manner of hardware, from PC to potato, here's the 1993 game running from within a motherboard BIOS...
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You can now run Doom entirely within a motherboard BIOS
Source: PC Gamer (opens in a new tab)