For people curious about the differences between this and Uxn (as I was): https://benbridle.com/articles/bedrock-differences-from-uxn....
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Bedrock is a lightweight program runtime: programs assemble down to a few kilobytes of bytecode that can run on any computer, console, or handheld. The runtime is tiny, it can be implemented from scratch in a few hours, and the I/O devices for accessing the keyboard, screen, networking, etc. can be added on as needed.
I designed Bedrock to make it easier to maintain programs as a solo developer. It's deeply inspired by Uxn and PICO-8, but it makes significant departures from Uxn to provide more capabilities to programs and to be easier to implement.
Let me know if you try it out or have any questions.
how does that work?
You set up a palette of 16 colours, then write 0-15 to the coordinates where you want to set a pixel, but you can also choose between an overlapping foreground and background layer (colour 0 on the foreground layer is transparent).
I guess it's no more weird than some hardware designs from the 80's...
4 bits : color A
4 bits : color B
8 bits : select A or B for the first 8 pixels of the cell
In hindsight I don't think there was much advantage to the last bit being the odd one out. The code for setting individual pixels in a cell was pretty custom anyway. If I were to do it again, I'd place the color A pixel in the center.
And I do find myself working on a memory constrained device again, so perhaps I'll be giving it a go.