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From 4 to 16 to 1K Colors on an IBM Color/Graphics Adapter

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1k01_graffiti1k2

The idea that such multi-color trickery was possible came to me some time ago, as I was looking at reenigne’s code for patching up composite CGA emulation in DOSBox; messing with that patch during development gave me a much better picture of composite CGA’s inner workings. When I had ironed out the basic concept for this hack, I divulged it to reenigne for ‘peer review’ and for testing on real hardware. Soon enough, we had an improved recipe:

Take two familiar (though officially undocumented) tweaks. Blend to an even mixture producing a new effect.
Add one crucial new trick – an ingredient of reenigne’s devising.
Test and calibrate until blue in the face.

Read more here at 8088mph; also you could begin instead with this post at Reenigne’s blog.


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