You can get fancy and do gamma correction here to generate maybe 6bpp of grayscales, but the easiest way to do this is to do what a monochrome VGA monitor would have done: ignore R, B and only use G. So our first task is to transform the 5:5:5 palette to grayscale.

We know the palette contents because we have the game sourcecode. Anyway let's assume 320x200x8 on a 5:5:5 RAMDAC. It was definitely designed for 5:5:5 RAMDACs because 5:6:5 and 8:8:8 weren't part of the original VGA/MCGA spec. I don't remember if Doom ran preferentially in int 10h mode 13h MCGA 320x200x8bpp palettized, or an X-mode but I think the former. Less than a minute of thinking led me to this how-to, hence I conclude that while the idea is really cool and silly in the best engineering way, actually implementing it is trivially easy: This topic started a bit of an argument in another forum, because I assert that the 60Hz rendering isn't really exciting at all - because there's very little data being manipulated, and no realtime calculation at all - a LUT works fine. However, that could be because Notepad can't write the text fast enough on screen. The gameplay looks pretty smooth, although we did catch some screen tearing. It's Notepad, so obviously, Chiet replaced the graphics with characters and numbers. You can see the iconic 1993 shooter running in its full glory on Chiet's YouTube channel. Chiet said in a subsequent tweet that 'it'll take some work to polish NotepadDOOM into something releasable, but it'll almost certainly happen over the next couple days.' John Romero, one of Doom's creators, was impressed and replied to Chiet in a tweet that the mod was 'incredible.' Although Chiet didn't explain how the mod works, has committed to launching NotepadDOOM for other Doom fans to try out. Dubbed 'NotepadDOOM,' the project is fully playable. Tom's Hardware reports: Chiet highlighted that he didn't have to modify the Notepad application. The ingenious creator has gotten Doom (1993) to run at 60 FPS through the boring text editor in Windows. Game developer Sam Chiet has found another use for Microsoft Notepad.

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