Visualizing programs with side-effects in a postfix shell with a live-updating text-mode environment. Built all the way up from machine code without any dependencies (except an x86 processor and Linux kernel).


Project page: github.com/akkartik/mu

More context: mastodon.social/@akkartik/1048

*Editing functions in the Mu shell*


Long delay since my last video. Printing floating-point numbers is *really* hard. I'm still half-assing it.

As a follow-up to merveilles.town/@akkartik/1053, I'm tightening focus to two threads:

a) These Mu shell experiments, and
b) An extremely skeletal OS to drop the Linux kernel dependency.

Deprioritized for now:
a) Other processors: RISCV, ARM, RPi, etc.
b) Graphics, mouse, etc. Device priorities for the OS are disk then ethernet.

*Towards running Mu without Linux*

All Mu really needs so far is to print to screen and read from the keyboard. Here's a 2-minute video about achieving that:


It seems such a small thing. But I needed lots of help, as you can see from the additions to my credits: github.com/akkartik/mu/compare

Merry Christmas to all! What a beautiful world.

Project page: github.com/akkartik/mu

More context: mastodon.social/@akkartik/1048

*Switching gears to pure graphics*

Until now Mu has followed classic Unix: stdin, stdout, pure text mode.

But giving up an OS kernel requires controlling the screen myself. Which requires various complicated probing for hardware. Then programs handling various screen sizes.

Easier: just always assume some common graphics mode. Say 1024x768 with 256 colors.

Interestingly, the default palette has far fewer than 256 colors. (Pic: 1024 cols each contain color `col%256`.)


*2020: Flood-filling the Mu computer*

A year ago I had a prototype of a C-level programming language mapping 1:1 to Assembly that I _thought_ could be type-safe.

Since then, I:

* wrote an academic paper on it
* made it type-safe
* began a high-level language atop it
* got into video, with 15 2-minute screencasts
* and ran programs written in it on bare metal, without an OS, like, 5 years before I expected to.

❤️ to everyone who inspired, taught, debated, encouraged.


*Rendering text atop baremetal*

Mu can now render text atop baremetal x86.

Try clicking around from akkartik.github.io/mu/html/bar

The boot-up machine code reads a few sectors from disk, configures a keyboard handler, and loads a bitmap font (2KB for ASCII, with the option for more).

I use GNU Unifont. I believe that means Mu is now GPL v2. So stated. IANAL and I try not to think about software IP. But a font? Copyright seems reasonable there.

Next up: a text editor!


*A more international interface for rendering text*

New 2-minute video: archive.org/details/akkartik-2

You get just one fixed screen resolution: 1024x768, 256 colors. Widely available on modern machines, no drivers needed.

You get just one fixed-width bitmap font. No bold/italics, no anti-aliasing.

BUT it won't make assumptions about English and left-to-right order. I eventually want anybody to be able to customize it to their language.

Main project page: github.com/akkartik/mu

I've been trying to visualize the default 256-color palette I get on baremetal.


To my eyes it looks like I can/should just live in the first 128 colors.


I built a game of "snakes", but it came out more like an etch-a-sketch 😄


Play it on any non-windows:

git clone github.com/akkartik/mu
cd mu
./translate_mu_baremetal_emulated baremetal/ex7.mu
qemu-system-i386 disk.img

h/j/k/l to draw

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Merveilles is a community project aimed at the establishment of new ways of speaking, seeing and organizing information — A culture that seeks augmentation through the arts of engineering and design. A warm welcome to any like-minded people who feel these ideals resonate with them.